SERVICE MANUAL
MPS-IOOO
NOVEMBER 198G PN-3 19907-01
C^ commodore
COMPUTERS
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SERVICE MANUAL
MPS-1000
NOVEMBER 1986 PN-319907-01
o
Commodore Business Machines, inc.
1 200 Wilson Drive, West Ciiester, Pennsylvania 1 9380 U.S.A.
Commodore makes no expressed or implied war-
ranties with regard to the information contained
herein. The information is made available solely on
an as is basis, and the entire risk as to quality and
accuracy is with the user. Commodore shall not be
liable for any consequential or incidental damages
in connection with the use of the information con-
tained herein. The listing of any available replace-
ment part herein does not constitute in any case
a recommendation, warranty or guaranty as to
quality or suitability of such replacement part.
Reproduction or use without expressed permission,
of editorial or pictorial content, in any matter is
prohibited.
This manual contains copyrighted and proprietary information. No part
of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical,
photocopying, recording or otherwise, without the prior written permis-
sion of Commodore Electronics Limited.
Copyright © 1986 by Commodore Electronics Limited.
All rights reserved.
REV.-A
PRECAUTIONS
[^ Precautionary notations throughout the text are categorized relative to 1 ) personal injury, and 2) damage to
equipment:
DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury.
Great caution should be excercised in performing procedures preceded by a DANGER
heading.
WARNING Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/
maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE
HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCE-
DURE.
2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH
BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN
THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CON-
NECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE
POWER SUPPLY CABLE MUST BE CONNECTED, USE EXREME CAUTION IN WORKING
ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
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WARNING
1. REPAIRS ON OUR PRODUCT SHOULD BE PERFORMED ONLY BY OUR CERTIFIED RE-
PAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE,
LISTED ON THE SERIAL NUMBER/RATING PLATE. IF OUR PRODUCT HAS A PRIMARY
AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE, DO NOT CONNECT IT
TO THE POWER SOURCE.
3. ALWAYS VERIFY THAT OUR PRODUCT HAS BEEN DISCONNECTED FROM THE POWER
SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR
INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE np CHIPS AND CIRCUITRY, USE STATIC DIS-
CHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING IN-
TERNAL COMPONENTS.
5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS RE-
COMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE ICs OR
OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY
APPLICABLE OUR WARRANTY.
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REV.-A
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PREFACE
This manual describes theory of operation, maintenance, and repair of high-
quality, multifunctional, dot matrix printer: Commandore MPS-1000. The
manual concentrates on the features of the MPS-1 000.
The instructions and procedures included herein are intended for the exper-
ienced repair technician, and attention should be given to the precautions on
the preceding page. The chapters are organized as follows:
Chapter 1 - Provides a general product overview, lists specifications, and
illustrates the main components of the printer.
o
Chapter 2 - Describes the theory of printer operation.
Chapter 3 - Discusses the options.
Chapter 4 - Includes a step-by-step guide for product disassembly, as-
sembly, and adjustment.
Chapter 5 - Provides the approved techniques for troubleshooting.
Chapter 6 - Describes preventive maintenance techniques and lists lubri-
cants and adhesives required to service the equipment.
Chapter 7 - Includes IC descriptions, schematics, and reference materials.
* The contents of this manual are subject to change without notice.
,/^
REV.-A
REVISION TABLE
^^
REVISION
DATE ISSUED
CHANGE DOCUMENT
A
July 1,1986
1 St issue
^
VI
REV.-A
TABLE OF CONTENTS
^^ CHAPTER 1. PRODUCT DESCRIPTION
CHAPTER 2. PRINCIPLES OF OPERATION
CHAPTERS. OPTIONAL EQUIPMENT
CHAPTER 4. DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT
CHAPTER 5. TROUBLESHOOTING
CHAPTER 6. MAINTENANCE
CHAPTER 7. REFERENCE MATERIALS AND SCHEMATICS
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REV.-A
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CHAPTER 1
PRODUCT DESCRIPTION
1 .1 FEATURES 1 -1
1 .2 SPECIFICATIONS 1 -2
1 .3 INTERFACE OVERVIEW 1 -7
1.3.1 Commodore Serial Interface 1-7
1 .3.2 Centronics Parallel Interface 1-11
1.4 MAIN COMPONENTS 1-14
1 .4.1 Power Supply Circuit 1-15
1 .4.2 CATX Control Board 1 -1 7
1.4.3 COMI Circuit Board 1-18
1.4.4 Printer JVIechanism 1-19
1 .4.5 Housing 1 -20
1 .5 SELF TEST 1 -21
1 .6 DIP SWITCH AND JUMPER SETTINGS 1 -22
n
LIST OF FIGURES
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
Fig.
-1 Printable Area of Fanfold Paper 1 -4
-2 Printable Area of Cut Sheet 1 -5
-3 Serial Connector 1-7
-4 Serial Interface Timing Chart 1 -8
-5 Data Structure 1-10
-6 Parallel Intef ace Timing Chart 1-13
-7 Power Supply Components (1 20V Ver.) 1-15
-8 Power Supply Components (220 and 240V Ver.) 1-16
-9 CATX Control Board (1 20V and 240V Ver.) 1 -1 7
-10 CATX Control Board (220V Ver.) 1-17
-1 1 COMI Circuit Board 1 -1 8
-1 2 Printer Mechanism 1-19
-1 3 Housing (Upper Case and Lower Case) 1 -20
-14 ROM Error Occurance 1-21
-15 RAM Error Occurance 1-21
D
- 1-i -
REV.-A
Table 1-1
Table 1-2
Table 1-3
Table 1-4
Table 1-5
Table 1-6
Table 1-7
Table 1-8
LIST OF TABLES
Serial Connector Pin Assignments 1-7
Parallel Connector Pin Assignments 1-11
DIP Switches Setting for Commodore Mode
(1 20V and 240V Version) 1 -22
DIP Switch Setting for Commodore Mode
(220V Version) 1-22
International Character Sets 1-23
DIP Switch Setting for IBM 51 52+ Mode
{1 20V and 240V Version) 1 -23
DIP Switch Setting for IBM 51 52+ Mode
{220V Version) 1-24
Jumper Setting 1-24
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- 1 -ii -
REV.-A
1.1 FEATURES
The Commodore MPS-1 000 is multifunctional, impact dot matrix printer capable of producting bidirection-
(^^^^ al print at 1 00 characters per second. The printer feature small size, light weight, and high performance, in-
cluding the following functions:
(1 ) Impact dot matrix printing.
(2) 9 needles - print head.
(3) 1 00 cps printing speed for Draft printing.
(4) 20 cps printing speed for NLQ printing.
(5) Friction feed.
(6) Tractor feed.
(7) Cut Sheet Feeder (optional).
(8) Three printing mode.
Commodore mode with Comodore serial interface.
IBM-51 52+ mode with Commodore serial interface.
IBM-51 52+ mode with Commodore parallel interface.
NOTE: IBM 51 52+ mode is IBM51 52 compatible with enhancement.
(9) Near Letter Quality 1 font resident for each mode.
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1-1
REV.-A
1.2 SPECIFICATIONS
Operation Characteristics
(a) Commodore mode
Printing speed:
Draft(Pica):
1 00 ops
Double-width:
SOcps
NLQ:
20cps
Double-width NLQ:
lOcps
u
Line spacing:
Dot matrix format:
Character sets:
Character size:
1 /21 6" to 1 27/21 6" (1 /6" at power on)
12Wx18H NLQ characters
9W X 9H standard characters
6W X 8H standard characters (for Graphics characters)
1 2W X 7H reversed standard characters
Commodore Graphics character set
Commodore Business character set
Character Pitch
Width (mm)
Height (mm)
Pica
2.1
3.1
Double-width
4.2
3.1
Reversed Draft
4.2
2.5
Column width (maximum characters/line):
Character Pitch
Column Width
Column/inch
Pica
80
10
Double-width
40
5
Reversed Draft
40
5
^
Printing direction:
Duty cycle:
Line feed time:
Paper feed method:
Bidirectional with logical seeking in the text mode and Graphic
characters. Unidirectional (left to right) in the bit image mode
or set from a DIP switch.
Sustain a print rate of 9 dots per character on an 80-character
line after temperature stabilization.
Approximately 1 50 ms/line for 1 /6" line spacing.
Pproximately 1 00 ms/line for a page feed.
Friction feed.
Tractor feed.
Cut sheet feeder (optional).
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1-2
REV.-A
(b) IBM 51 52+ mode (for both interfaces)
Printing speed:
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Line spacing:
Dot matrix format:
Character sets:
Pica: lOOcps
Double-width : 50 cps
Emphasized: 50 cps
Double-width emphasized: 25 cps
Condensed: 82 cps
Double-width condensed: 41 cps
Elite: 60 cps
Double-width elite: 30 cps
Programmable Minimum 1 /21 6" (1 /6" at power on)
9W X 9H standard characters
6W X 1 2H standard characters (for Graphics characters)
1 2W X 1 8H NLQ characters
Draft ASCII characters
Draft Internatinal characters
Graphics characters
NLQ ASCII
NLQ International
Character size:
n
Character Pitch
Width (mm)
Height (mm)
Pica
2.1
3.1
Elite
1.4
3.1
Condensed
1.05
3.1
Double-width Pica
4.2
3.1
Double-width Elite
2.8
3.1
Double-width Condensed
2.1
3.1
Emphasized
2.1
3.1
Double-width Emphasized
4.2
3.1
Super/Subscript
depends on pitch.
1.6
Column width (maximum characters/line):
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Character Pitch
Column Width
Column/inch
Pica
80
10
Elite
96
12
Condensed
132(137)*
17
Double-width Pica
40
5
Double-width Emphasized
40
5
Double-width Elite
48
6
Double-width Condensed
66 (68)*
8.5
Emphasized
80
10
NOTE: * When Left/Right margin is set with ESC X.
1-3
REV.-A
Printing direction:
Duty cycle:
Line feed time:
Paper feed method:
Paper Specifications
Fanfold paper:
Cut sheet:
Copies:
Paper path:
Basic weight of paper:
Ribbons exclusive:
Printable area:
Bidirectional with logical seeking in the text mode and Graphic
characters. Unidirectional (left to right) in the bit image mode
or programmable from a host computer,
same as Commodore mode,
same as Commodore mode,
same as Commodore mode.
The adjustable tractor feed can handle paper 1 01 .6 mm (4") to
254 mm (10") wide.
The built-in friction feed mechanism can handle paper 1 82
mm (7.1 5") to 21 6 mm (8.5") wide.
Up to 2 sheets (including the original)
Total paper thickness not to exceed 0.1 3 mm (0.005").
Rear
46.5 to 81 .4 g/square m for 1 sheet.
39.5 to 52.3 g/square m for multi-form.
Black ribbon cartridge.
Fanfold paper: See Fig. 1 -1
Cut sheet: See Fig. 1-2
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Print area
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The border width indicated by the asterisks (*) varies according to the paper width.
With 254 mm paper, the border width is 25.4 mm.
With 241 mm paper, the holder width is 1 9 mm.
Fig. 1 -1 . Printable Area of Fanfold Paper
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1-4
REV.-A
/^^
1
182mm(7.15")~216mm(8.5")
Min. 3
Print area
mm 203.2 mm Min. 3
mm
Min. 25 mm
Max. 305 mm (12")
ABC XYZ
XYZ ABC VWX
Min. 30 mm
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Electrical Specifications
Power line voltage:
Power line freequency range:
Power consumption:
D.C. insulation resistance:
Dielectric strength:
Fig. 1 -2 Printable Area of Cut Sheet
AC 120V ± 10%
AC 220V ± 10%
AC 240V ± 10%
49.5 Hz to 60.5 Hz
60 VA maximum
Over 1 M ohms (between the AC line and chassis)
1 000 VAC, 1 min. (for 1 20 VAC version)
1 500 VAC, 1 sec. (for 220/240 VAC version)
Environmental Specifications
Temperature
Storage:
Operating:
Humidity
Storage:
Operating:
Shock
Storage:
Operating:
Vibration
Storage:
Operating:
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-sec to 650C (-22''F to 1 49°^
5<>Cto35'>C(41<>Fto95''F)
5% to 85% RH (no condensation)
1 0% to 80% RH (no condensation)
2G, 1 msec.
1 G, 1 msec.
0.50 G (55 Hz max.)
0.25 G (55 Hz max.)
1-5
REV.-A
Reliability Specifications
MCBF - Mechanism 3 million lines (excluding print head)
Life of Print head 1 00 million characters
Life of Ribbon 1 million characters {^
NOTE: MCBF: Mean Cycle Between Failure.
Safety Standard Agency and Radio Frequency Interference. (R.F.I.)
Safety Standard: UL 114 (U.S.A.)
CSA 22.2 number 0,1 54 (Canada)
Applied by Commodore (TBD)
VDE 0806 (Germany)
R.F.I. FCC class B (U.S.A.)
Physical specifications
Dimensions: Height: 84 mm
Width: 421 mm
Depth: 314 mm
Weight: 5.2 kg
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1-6
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REV.-A
1.3 INTERFACE OVERVIEW
The MPS-1 000 printer has Commodore serial interface and Centronics parallel interface. It has three com-
bination modes of control systems and interfaces.
Commodore control system with Commodore serial interface.
IBM 51 52+ control system with Commodore serial interface.
IBM 51 52+ control system with Centronics parallel interface.
This section describes the specifications of each interface.
D
1 .3.1 Commodore Serial Interface
The serial interface is used when the printer is in its Commodore mode or IBM 51 52+ mode. Connector pin
assignments and a description of respective interface signals are shown in follow.
(1 ) Input connector (TCS 0560-01 -1 01 0)
Fig. 1 -3. Serial Connector
Table 1-1
. Serial Connector Pin Assignments
Pin No.
Signal
Direction
Description
1
SERIAL SRQ
OUT
Always "HIGH".
(Pulled up to +5V through a 3.3 ki2 register.)
2
GND
-
GND
3
SERIAL ATN
IN
Low when the host sends a command to de-
vices.
4
SERIAL CLK
IN
Synchronous signal when the host transmits a
serial data.
5
SERIAL DATA
IN/OUT
Signal when the host transmits serial data, or
to verify the device status.
6
RESET
IN
Reset input.
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NOTES: 1 . When Commodore serial l/F is selected, disconnect parallel cable.
2. Direction refers to the direction of signal flow as viewed from the printer.
1-7
REV.-A
(2) Serial Interface Timing Chart
h
BYTE SENT UNDER ATTENTION (TO DEVICES)
r- TALKER READY-TO-SEND
I r TALKER SENDING
CLOCK
DATA
T
^
""Lnnnnnjuin
lyiiJliiliiLiJliJliJliI
NORMAL DATA BYTES
RTS
RTS
HH i^-^r rrnnnnnnnnn rnnnnn
r ^ DATA VALLIED
■-LISTENER READY-FOR-DATA
-Tbb
-Tpr— *j*
LJldlzJliJliJliJliI
•-LISTENER
DATA-ACCEPTED
I- DATA VALIED
•- LISTENER READY-FOR-DATA
|TF
Tbb
TNEfTi
Tpr| Th
L LISTENER HOLD OFF
■ LISTENER DATA ACCEPTED
u
END-OR-IDENTIFY HANDSHAKE ( LAST BYTE IN MESSAGE)
ATN
crocRJinnn f
r TALKER READY-TO-SEND
I r TALKER SENDING
CLOCK
DATA
Tbb
UbJliJlzJ LU — LP
innnnnnn n r
TprH Kth H*- Tye H Tey I TSY I
1
I Tf |Tpf
[
I "-LISTENER READY-FOR-DATA
EOI-TIMEOUT HANDSHAKE
LISTNER READY-FOR-DATA
SYSTEM LINE RELEASE-^
^r^l A 1 ^1 1^ ^lAAIIkl^
EXTERNAL DEVICE
NOTES
SERIAL BUS TIMING
LISTENER {fiSEQ
TALKER {fiSEQ
DESCRIPTION
SYM.
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
ATN RESPONSE
TAT
~~
^
1000
If MAX. time exceed-
ed, device not pre-
sent error.
LISTENER HOLD OFF (NRFD)
TH
-
Listner must hold off
until CLK= HIGH
NON-EOI RESPONSE TO (RFD)
BIT SETUP
DATA VALID
Tne
Ts
TV
20
20
20
40
70
40
200
40
40
60
80
60
80
-
If MAX. time exceed-
ed, EOl response re-
quired.
FRAME HANDSHAKE
FRAME TO RELEASE OF ATN
TIME BETWEEN BYTES
DOI RESPONSE TIME
EOl RESPONSE HOLD
TALKER RESPONSE LIMIT
BYTE-ACKNOWLEDGE
TALK-ATN RELEASE
TALK-ATN ACKNOWLEDGE
TALK-ATN ACK HOLD
Tf
TR
Tbb
TYE
TEI
Try
Tpr
Ttk
Tdc
Tda
20
20
100
200
100
20
20
20
90
60
80
250
60
30
60
20
100
1000
200
100
70
60
90
80
If MAX. time exceed-
ed, frame error.
EOI-BYTEACK
Ter
60
-
180
20
-
180
TED series computer
ATN TO CLOCK LOW
TALK ERROR RELEASE
TCL
TRR
-
40
100
20
-
-
If used with VIC-20,
TCL MAX. 3000 //sec.
^
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Fig. 1-4. Serial Interface Timing Chart
1-8
REV.-A
O
(3) Serial interface protocols
Explanation of Terms: LA - Listen address
TA- Talk address
SA- Secondary address
SA (0) - Secondary address open
SA (C) - Secondary address close
DB - Data byte
FN - File name byte
eoi - End or identify handshake
TKATN-Talk-Atn handshake
Command
Abbreviation
Binary Value
Talk Address
(TA)
OlOxxxxx
Listen Address
(LA)
OOlxxxxx
Untalk
(UNTLK)
0101 1111
Unlisten
(UNLSN)
001 1 1 1 1 1
Secondary Address Open
(SA(0))
1111 yyyy
Secondary Address Close
(SA(C))
1110 yyyy
Secondary Address Normal
(SA)
Ollzzzzz
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NOTE: 1 . Device Address (TA) (LA) = x xxxx values 0-30 possible
0-3 Intrnal device
4-7 Normal CBM printers
8-11 normal disk units
1 2 - 30 unused
2. Channel address (SA(0)) (SA(C)) = yyyy values 0-15 possible
PRG-TYPE Read Data Channel (special)
1 PRG-TYPE Write Data Channel (special)
12-14 Channel for all file types (read/write)
1 5 Unit command channel (read/write)
3. Normal Secondary address (SA) = z zzzz values 0-31 possible
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Load: This routine loads data bytes from any input device directly into the host memory.
LASA{0) FN1 FN2...FNn-1 eoi FNn UNLSN =>
TA SATKATN DB1 DB2...DBn-1 eoi DBn UNTLK=>
TASA(C) UNLSN
Save: This routine saves a section of memory.
LASA(O) FN1 FN2...FNn-1 eoi FNn UNLSN =>
TA SA DB1 DB2... DBn-1 eoi DBn UNLSN =>
LA SA(C) UNLSN
Open: This routine is used to open a logical file for I/O operations.
with SA LA SA(0) FN1 FN2...FNn-1 eoi FNn UNLSN
1-9
REV.-A
Close: This routine is used to close a logical file after all I/O operations have been completed on
with SA that file.
LA SA (C) UNLSN
Chkout: This routine must be called before any data is sent to any output device.
with SA LA SA
Chkin: This routine is called to define any previously opened channel as a input channel.
withSA TASATLKATN
Chrout: This uses a single character buffer, and will send previously buffered character, if any exists.
This buffer is also sent along with eoi, prior to sending any SERIAL BUS COMMAND sequence
(LA, TA, SA(0), SA(C), SA ULTLK, UNLSN).
Chrin: This routine is called to get a byte of data from a channel already set up as a input channel.
DBc or eoi DBc (if external device sends eoi)
Getin: -see Chrin -
CIrchn: This routine is used to clear and restore all open channels to there default values.
If Chkin channel open: UNTLK
If Chkout channel open: eoi DBc UNLSN
Clall: -see CIrchn -
Stop: This routine is used to detect the stop key. If stop key down, CIrchn called.
u
ATN
LA SA DATA LAST DATA UNLISTEN
u
ATN
EOI-HANDSHAKE
SYSTEM
LINE RELEASE
Fig. 1 -5. Data Structure
NOTE: 1 . Data is processed by synchronous transfer with CLOCK.
2. The first bit is the LSB. All bits are of 8-bit construction.
3. Listener address data is 24H or 25H, device 4 and 5 respectively.
4. SA is 6XH, OFXH, OEXH, where X is OOH... OFH.
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1-10
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REV.-A
1.3.2 Centronics Parallel Interface
The parallel interface is used when the printer is in its IBM 51 52+ mode. Connector pin assignments and a
description of respective interface signals are shown in follow.
(1 ) Connector pin assignment
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Table 1-2
Parallel Connector Pin Assignments
Signal
Pin No.
Return
Pin No.
Signal
Direction
Description
1
19
STROBE
In
STROBE pulse to read data in. Pulse width must be
more than 0.5 /is at receiving terminal.
2
20
DATA1
In
These signals represent information of the 1 st to
8th bits of paralle data, respectively. Each signal is
at "HIGH" level when data is logical "1" and "LOW"
when logical "0".
3
21
DATA 2
In
4
22
DATA 3
In
5
23
DATA 4
In
6
24
DATA 5
In
7
25
DATA 6
In
8
26
DATA 7
In
9
27
DATA 8
In
10
28
Out
Approx. 5 jUS pulse. "LOW" indicates that data has
been received and that the printer is ready to accept
other data.
ACKNLG
11
29
BUSY
Out
A "HIGH" signal indicates that the printer cannot re-
ceive data. The signal becomes "HIGH" in the fol-
lowing cases:
1. During data entry
2. During printing operation
3. During printer error status
12
30
PE
Out
A "HIGH" signal indicates that the printer is out of
paper.
13
pulled up to +5V through 3.3 k ohms resistance.
14
NC
Not used.
15
NC
Not used.
16
OV
Logic ground level.
17
CHASSIS
GND
Printer chassis GND.
In the printer, the chassis GND and the logic GND
are isolated from each other.
18
NC
Not used.
19 to 30
GND
TWISTED-PAIR RETURN signal GND level.
1-11
REV.-A
Signal
Pin No.
Return
Pin No.
Signal
Direction
Description
31
INIT
In
When the level of this signal becomes "LOW", the
printer controller is reset to its initial state and the
print normally at "HIGH" level, and its pulse width
must be more than 50 fjs at the receiving terminal.
32
Out
The level of this signal becomes "LOW" when the
printer is in —
1 . PAPER END state
2. OFF-LINE state
3. Error state
ERROR
33
GND
Same as for pins 1 9 - 30.
34
NC
Not used.
35
Pulled up to +5V through 3.3 k ohms resistance.
36
NC
Not used.
"U
NOTE: 1 . "Direction" refers to the direction of signal flow as viewed from the printer.
2. "Return" denotes "TWISTED PAIR RETURN" and is to be connected at signal ground le-
vel.
As to the wiring for the interface, be sure to use a twisted-pair cable for each signal and
never fail to complete connection of the Return side. To prevent noise effectively, these
cables should be shielded and connected to the chassis of the host computer and the
printer, respectively.
3. All interface conditions are based on TTL level. Both the rise and fall times of each signal
must be less then 0.2^.
4. Data transfer must not be carried out by ignoring the ACKNLG or BUSY signal.
(Data transfer to this printer can be carried out only after confirming the ACKNLG signal or
when the level of the BUSY signal is "LOW".)
5. Under normal conditions, printer cable pins 11,12 and 32 are activated when out of paper is
detected.
ESC 8 code disable pins 1 1 and 32 from the PE (Paper-End) signal, but it does not disable pin
12.
6. When parallel l/F is selected, disconnect Commodore serial cable.
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1-12
(2) Parallel interface timing chart
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REV.-A
BUSY
ACKNLG
DATA
STROBE
■ih
•^^
\
0.5us(Min.)
0.5jJs(Min.)
0.5;js(Min.)
Approx . 5>is
r^
r^.
Fig. 1 -6. Parallel Interface Timing Chart
1-13
REV.-A
1.4 MAIN COMPONENTS
The MPS-1000 includes four major subassemblies - the power supply, the circuit boards, COMI in-
terface board, and printer mechanism - all of which are housed in a two-piece plastic case. ( )
The kinds of circuit board are described in follow.
CATX Board: Main Control Circuit Board for 1 20V and 240 V Ver.
UNIT No. Y560201 40000
CATX Board: Main Control Circuit Board of 220V Ver.
UNIT No. Y560201500OO
COMI Board: Interface Circuit Board
UNIT No. Y561 20800000
CFIL Board: Filter Circuit Board
UNIT No. Y560202500OO (1 20V Ver.)
UNIT No. Y560202200OO (220/240V Ver.)
COMPNL Board: Control Panel Board
UNIT No. Y563501 OOOOD
^
^
1-14
o
REV.-A
1 .4.1 Power Supply Circuit (Figs. 1 -7 and 1 -8)
A DC regulator, line filter, and power transformer make up the power supply, which converts the AC line
voltage to DC voltages usable by the printer subassemblies. A fuse is inserted in the input circuit to pre-
vent product damage due to overcurrent. The power supply components are connected to the lower case
as illustrated.
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Fig. 1 -7. Power Supply Components (1 20V Version)
r^.
1-15
REV.-A
U
Fig. 1 -8. Power Supply Components (220 and 240V Version)
u
L^
1-16
o
REV.-A
1 .4.2 CATX Control Board (Figs. 1 -9 and 1 -1 0)
The CATX circuit board includes all of the logic components which control operation of the printer, includ-
ing a 781 CPU, a 2k-byte 6116 RAM, and driver ICs for the carriage and paper feed motors. A gate array
is also incorporated into the simple design of the circuit.
The difference of Fig. 1 -9 and Fig. 1 -1 is only DIP SW2.
o
Fig. 1 -9. CATX Control Board (1 20V and 240V Version)
DIP SW2
r^,
Fig. 1-10. CATX Control Board (220V Version)
1-17
REV.-A
1 .4.3 COMI Interface Board (Fig. 1-11)
The COMI Interface Board is mounted on the CATX circuit board. It consists of a serial interface
connector for Commodor and IBM modes, a Centronics parallel interface connector for IBM mode and a
control 27256 ROM.
The CPU781 on the CATX board is controlled by program in this ROM.
There are two kinds of control ROM:
27256 (CE8-En) is used for 1 20V and 240V Version.
27256 (CE8-Ln) is used for 220V Version.
u
u
Fig. 1-11. COMI Board
U
1-18
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REV.-A
1 .4.4 Printer Mechanism (Fig. 1 -1 2)
The printer mechanism is composed of a friction platen, simplified carriage assembly, paper feed and car-
riage motors, printhead, ribbon feed mechanism, sensors and detachable sprocket unit. A cut sheet
feeder are available as options.
Sprocket unit
Home sensor
O
Printhead
Carriage assembly
Paper feed motor
Carriage motor
Print timing sensor (PTS)
Friction platen
Fig. 1 -1 2. Printer Mechanism
r>
1-19
REV.-A
1.4.5 Housing (Fig. 1-13)
The housing, consisting of the upper and lower cases, accomodates the printer mechanism, control circuit
board, and the power supply circuit as described above. The lower case is designed to facili-
tate easy access, removal, and replacement of those components. (The lower case is also used as a frame
for the printer mechanism.)
v^
u
Fig. 1 -1 3. Housing (Upper Case and Lower Case)
^
1-20
REV.-A
O
1.5 SELF TEST
The printer has a self-test function to check the following.
(1) ROM, RAM check
(2) Print head operation and print quality
(3) Operation of the printer mechanism (motor, ribbon cartridge mechanism, drive belt, etc.)
O
The self-test function is preprogrammed in the printer's circuit and can be performed by turning the power
switch on while pressing the LF switch for testing Draft mode or the FF switch for testing NLQ mode.
All characters provided by the internal software are printed out on the paper.
The self-test funciton, however, can't be performed when the printer is out of paper.
If there is any trouble on ROM, the printer displays it be blinking ONLINE LED in below timing. (See Fig.
1-14.)
o
0.25
approx. [sec]
2.0
0.25
LED
ON
LED
ON
LED
OFF
REPEAT
FOREVER
Fig. 1-14. ROM Error Occurance
If there is any trouble on RAM, the printer displays it by blinking ONLINE LED in below timing. (See Fig.
1-15.)
0.25
0.25
0.25
approx. [sec]
2.0
0,25
0.25
0.25
LED
ON
LED
OFF
LED
ON
LED
OFF
LED
ON
LED
OFF
LED
ON
REPEAT
FOREVER
Fig. 1 -1 5. RAM Error Occurance
1-21
REV.-A
1.6 DIP SWITCH AND JUMPER SETTINGS
The DIP SW is positioned at the rear center of the printer, and has the functions as shown in Table 1 -3 and
1 -6 for 1 20V and 240V Version and Table 1 -4 and 1 -7 for 220V Version.
Table 1-8 describes jumpers available on the CATX board. Note that the states of the DIP switches are
read only when the power is switched on.
u
Table 1 -3. DIP Switch Setting for Commodore Mode (1 20V and 240V Version)
SWNO.
Function
ON
OFF
Factory
Setting
1-1
Print Mode Selection
5152+
Commodore
OFF
1-2
Device Select
5
4
OFF
1-3
Buzzer
Mute
Beep
OFF
1-4
Controls the Cut-sheet Feeder
Valid
Invalid
OFF
1-5
NLQ/Draft Selection
NLQ
Draft
OFF
1-6
Page Length
12"
11"
OFF
1-7
Paper-out Sensor
Inactive
Active
OFF
1-8
Select Printing Direction
Unidirection
Bidirection
OFF
Table 1 -4. DIP Switch Setting for Commodore Mode (220V Version)
w
SWNO.
Function
ON
OFF
Factory
Setting
1-1
Print Mode Selection
5152+
Commodore
OFF
1-2
Device Select
5
4
OFF
1-3
Select Printing Direction
Unidirection
Bidirection
OFF
1-4
Controls the Cut-sheet Feeder
Valid
Invalid
OFF
1-5
NLQ/Draft Selection
NLQ
Draft
OFF
1-6
1-7
1-8
International Character Sets
See Table 1 -5
2-1
Page Length
11"
12"
OFF
2-2
OFF
2-3
Paper-out Sensor
Inactive
Active
OFF
2-4
Buzzer
Mute
Beep
OFF
^
1-22
Table 1 -5. International Character Sets
REV.-A
r\
1-6
1-7
1-8
Country
OFF
OFF
OFF
ASCII (USA/UK/Netherlands)
OFF
OFF
ON
Denmark/Norway
OFF
ON
OFF
Sweden/Finland
OFF
ON
ON
Germany
ON
OFF
OFF
France/Belgium
ON
OFF
ON
Italy
ON
ON
OFF
Switzerland
ON
ON
ON
Spain
Table 1 -6. DIP Switch Setting for IBM 51 52+ Mode (1 20V and 240V Version)
n
SWNO.
Function
ON
OFF
Factory
Setting
1-1
Print Mode Selection
5152+
Commodore
OFF
1-2
Device Select
CG Select
5
Table 2
4
Table 1
OFF
OFF
1-3
Interface
Serial
Parallele
OFF
1-4
Controls the Cut-sheet Feeder
Valid
Invalid
OFF
1-5
NLQ/Draft Selection
NLQ
Draft
OFF
1-6
Page length
12"
11"
OFF
1-7
Paper-out Sensor
Inactive
Active
OFF
1-8
Auto LF with CR
Valid
Invalid
OFF
.r^
NOTE: 1. When in the IBM mode with Centronics Parallel Interface (DIP SW. 1-1 on and DIP SW. 1-3
off), DIP SW. 1 -2 is defined to CG select.
2. When in the IBM mode with Commodore Serial Interface (DIP SW. 1-1 on and DIP SW. 1-3
on), DIP SW. 1 -2 is defined to Device select. And in this state default CG table is set to Table
1.
1-23
REV.-A
Table 1 -7. DIP Switch Setting for IBIVI 51 52+ Mode (220V Version)
SWNO.
Function
ON
OFF
Factory
Setting
1-1
Print Mode Selection
5152+
Commodore
OFF
1-2
Device Select
5
4
OFF
1-3
Auto LF with CR
Valid
Invalid
OFF
1-4
Controls the Cut-sheet Feeder
Valid
Invalid
OFF
1-5
NLQ/Draft Selection
NLQ
Draft
OFF
1-6
Character Set Selection
Table 2
Table 1
OFF
1-7
IBM International Group
Group II subset
Group 1 U.S.A.
OFF
1-8
Interface
Serial
Parallel
OFF
2-1
Page Length
12"
11"
OFF
2-2
OFF
2-3
Paper-out Sensor
Inactive
Active
OFF
2-4
Buzzer
Mute
Beep
OFF
i
NOTE: When in the IBM mode with Centronics Parallel Interface (DIP SW. 1 -1 on and DIP SW. 1 -8 off),
DIP SW. 1 -2 is not define any function.
^
Table 1 -8 Jumper Settings
Jumper No.
Description
Factory Setting
J1
OFF
ON: Latches the data at the trailing edge of STROBE
OFF: Latches the data at the leading edge of STROBE
J2
ON: 2KRAM
OFF: 8 K RAM
ON
J3
ON: 8KRAM
OFF: 2 K RAM
OFF
J4
ON: BKorlGKROM
OFF:32KROM
OFF
J5
ON: 32KROM
0FF:8Kor16KR0M
ON
J6
ON: /ZPD7811
OFF:/iPD7810
OFF
K^
1-24
REV.-A
CHAPTER 2
O PRINCIPLES OF OPERATION
2.1 SIGNAL FLOW AND CONNECTOR PIN ASSIGNMENT 2-1
2.2 POWER SUPPLY OPERATION 2-7
2.2.1 Filter Circuit 2-8
2.2.2 Power Transformer 2-8
2.2.3 Rectifier and Regulator Circuits 2-9
2.2.4 Vx Circuit 2-13
2.3 CATX BOARD OPERATION 2-1 4
2.3.1 Reset Circuit 2-14
2.3.2 Data Input and Decoding 2-1 5
2.3.3 Carriage IVIotor Control Circuit 2-18
2.3.4 Paper Feed IVIotor Control Circuit 2-23
2.3.5 Printhead Circuit 2-25
2.3.6 Buzzer Circuit 2-26
2.3.7 AD Converter 2-26
2.4 PRINTER IVIECHANISM OPERATION 2-28
2.4.1 Sensors 2-28
2.4.2 Carriage Mechanism 2-29
2.4.3 Paper Feed Mechanism 2-29
2.4.4 Printhead 2-31
2.4.5 Ribbon Drive Mechanism 2-31
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LIST OF FIGURES
g. 2-1 Cable Connections 2-1
ig. 2-2 Power Supply Block Diagram 2-7
ig. 2-3 CFIL Filter Board 2-8
g. 2-4 Power Transformer Windings 2-8
g. 2-5 Chopping Switching Regulator Operation 2-9
g. 2-6 Choke Input Filter Current Waveform 2-9
g. 2-7 +24V Regulator Circuit 2-10
g. 2-8 494 IC Block Diagram 2-1 1
ig. 2-9 494 IC and +24V Regulator Circuit 2-1 1
g. 2-1 Switching Transistors Q25 and Q27 2-1 2
g. 2-1 1 Flywheel Diode and Choke Input Filter 2-1 2
2-i
REV.-A
Fig. 2-1 2 +5V DC Regulator Circuit 2-1 3
Fig. 2-1 3 Vx Voltage Circuit 2-1 3
Fig. 2-1 4 CATX Control Board Block Diagram 2-1 4
Fig. 2-1 5 Reset Circuit 2-1 5
Fig. 2-1 6 Address Decoder Circuit 2-1 6
Fig.2-1 7 Memory Map 2-1 6
Fig. 2-1 8 Input and Download Buffering 2-1 7
Fig. 2-1 9 Carriage Control Circuit 2-1 8
Fig. 2-20 Carriage Motor Timing Circuit 2-1 9
Fig. 2-21 PTS Sensor Operation 2-20
Fig. 2-22 Closed Loop Operation 2-22
Fig. 2-23 Paper Feed Motor Control Circuit 2-23
Fig. 2-24 Print Timing 2-25
Fig. 2-25 Energizing Pulse 2-25
Fig. 2-26 Buzzer and PE Circuit 2-26
Fig. 2-27 AD Converter 2-26
Fig. 2-28 Relationship between Head Driver Voltage and
Energizing Pulse Width 2-27
Fig. 2-29 Printer Mechanism 2-28
Fig. 2-30 Sensor Operation 2-28
Fig. 2-31 Carriage Mechanism 2-29
Fig. 2-32 Friction Feed Mechanism 2-30
Fig. 2-33 Sprocket Feed Mechanism 2-30
Fig. 2-34 Printhead Firing 2-31
Fig. 2-35 Ribbon Drive Mechanism 2-31
LIST OF TABLES
Table 2-1 CATX Board Connector Summary 2-2
Table 2-2 COMI Board Connector Summary 2-2
Table 2-3 CN2 Pin Assignment (Power) 2-2
Table 2-4 CN3 Pin Assignment (COMI CN4) 2-3
Table 2-5 CIM4 Pin Assignment (Control Panel) 2-4
Table 2-6 CN5 Pin Assignment (Printhead) 2-4
Table 2-7 CIM6 Pin Assignment (HP sensor) 2-5
Table 2-8 CN7 Pin Assignment (Motors and PTS) 2-5
Table 2-9 CN8 Pin Assignment (PE sensor) 2-5
Table 2-10 CN10 Pin Assignment (COMI CN3) 2-6
U
^
^
2-ii
REV.-A
Table 2-1 1 Power Supply Voltages 2-7
Table 2-1 2 Carriage Motor Voltages 2-1 8
^ ^ Table 2-1 3 Carriage Motor Drive Sequence 2-20
Table 2-14 Carriage Timing Data 2-21
Table 2-1 5 Acceleration Control 2-24
Table 2-1 6 Deceleration Control 2-24
Table 2-1 7 Paper Feed Motor Drive Sequence 2-24
Table 2-1 8 Paper Feed Pitch 2-24
O
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2-iii
u
u
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REV.-A
O
2.1 SIGNAL FLOW AND CONNECTOR PIN ASSIGNMENT
The interconnection of the primary subassemblies of the MPS-1000 is diagrammed in Figure 2-1, blow.
Table 2-1 and 2-2 summarize the purpose, size, and type of the connectors designated in the figure, and
Table 2-3 through 2-1 list the signals exchanged on each.
COMPNL
CONTROL
PANEL
BOARD
c
POWER
TRANS-
FORMER
A
r^
CFIL
FILTER
BOARD
CN4
9 pin
ON
2
6 pin
PRINTER MECHANISM
/\ STEPPER/ \
iz
MOTOR
DRIVE
PTS
CN7
DATA
CN5
18 pin
12 pin
CATX BOARD
AGIN
PE
iz
HOME
CN8
iz
CN6
2 pin
4 pin
ON
10
26 pin
28 pin
ON
3
26 pin
CN
4
COM!
BOARD
CN
3
28 pin
6 pin 36 pin
CN2
CNI
A VV
Parallel l/F
Fig. 2-1 . Cable Connections
r^
2-1
REV.-A
Table 2-1 . CATX Board Connector Summary
Connector
Purpose
Pins
Reference
Table
CN2
Power supply to control circuit board
6
2-3
CN3
COIVII Board to control circuit board
26
2-4
CN4
Control panel to control circuit board
9
2-5
CN5
Control circuit board to printhead
12
2-6
CN6
HOME (HP) sensor to control board
4
2-7
CN7
Control board to carriage and paper feed motors and PTS sensor
18
2-8
CN8
PE sensor to control board
2
2-9
CN10
COMI Board to control circuit board
28
2-10
u
Table 2-2. COMI Board Connector Summary
Connector
Purpose
Pins
Reference
Table
CN1
Parallel interface
36
1-2
CN2
Serial interface
6
1-1
CN3
From CN 10 of CATX
28
2-10
CN4
From CN3 of CATX
26
2-4
w
Table 2-3. CN2 Pin Assignment (Power)
Pin
Signal
Lead Color
Description
1
AC3
Blue
1 2V AC for optional interface
2
AC3
Blue
3
AC2
Purple
1 0V AC for logic circuit
4
AC2
Purple
5
AC1
Red
28V AC for stepper motor.
6
AC1
Red
^
2-2
REV.-A
r>
r^
Table 2-4. CN3 Pin Assignment (COM I CN4)
Pin
Signal
Direction
Description
1
ERR
Out
Error
2
RE
Out
Paper end
3
D7 (CLK)
In
Data bit 7 (Serial CLK)
4
BUSY
Out
Ready
5
D6 (ATN)
In
Data bit 6 (Serial ATN)
6
ACK
Out
Acknowledge
7
D5
In
Data bit 5
8
In
INIT (RESET)
Initial (RESET)
9
D4
In
Data bit 4
10
STB
In
Strobe
11
D8
In
Data bit 8
12
AC12
Out
Not used
13
RS
Out
Reset
14
AC12
Out
Not used
15
D3
In
Data bit 3
16
+5
Out
+5VDC
17
D2
In
Data bit 2
18
+24
Out
Not used
19
D1
In
Data bit 1
20
+12
Out
Not used
21
P/S
In
Not used
22
23
In
Select in (Serial DATA)
SELIN (S DATA)
24
GL
Ground
25
TXD PET/TRS
In
Not used
26
GL
Ground
NOTE: Signal direction is viewed from
The parenthesized descriptions
the control circuit board,
are for the serial interface.
r^
2-3
REV.-A
Table 2-5.
CN4 Pin Assignment (Control Panel)
Pin
Signal
Direction
Description
1
+5
Out
LED drive power
2
RDYLP
Out
READY LED drive signal
3
PELP
Out
PAPER END LED drive signal
4
BUZZER
Out
Buzzer drive signal
5
ON LINE LP
Out
ON LINE LED drive signal
6
ON LINE SW
In
ON/OFF LINE switching signal
7
LFSW
In
LINE FEED signal
8
FFSW
In
FORM FEED signal
9
GL
Logic ground
u
NOTE: Signal direction is viewed from the control circuit board.
Table 2-6. CN5 Pin Assignment (Printhead)
Pin
Signal
Direction
Description
1
HD2
Out
Print solenoid #2 drive signal
2
HD4
Out
Print solenoid #4 drive signal
3
HD6
Out
Print solenoid #6 drive signal
4
HD8
Out
Print solenoid #8 drive signal
5
HD9
Out
Print solenoid #9 drive signal
6
+24
Out
Print solenoid common line (+24V Power)
7
+24
Out
Print solenoid common line (+24V Power)
8
+24
Out
Print solenoid common line (+24V Power)
9
HD5
Out
Print solenoid #5 drive signal
10
HD7
Out
Print solenoid #7 drive signal
11
HD1
Out
Print solenoid # 1 drive signal
12
HD3
Out
Print solenoid #3 drive signal
^
NOTE: Signal direction is viewed from the control circuit board.
^
2-4
REV.-A
r^
n
n
Table 2-7. CN6 Pin Assignment (HP sensor)
Pin
Signal
Direction
Description
1
Gh
HOME (HP) sensor GND
2
HOME
In
HOME (HP) sensor R signal
3
Gh
HOME (HP) sensor GND
4
H+5
Out
HP sensor LED power
NOTE: Signal direction is viewed from the control circuit board.
Table 2-8. CN7 Pin Assignment (Motors and PTS)
Pin
Signal
Direction
Description
1
CRA
Out
Carriage motor phase A
2
CRC
Out
Carriage motor phase C
3
CRB
Out
Carriage motor phase B
4
CRD
Out
Carriage motor phase D
5
CRCOM
Out
Carriage motor phases C & D common line
6
CRCOM
Out
Carriage motor phases A & B common line
7
LFA
Out
Paper feed motor phase A
8
LFC
Out
Paper feed motor phase C
9
LFB
Out
Paper feed motor phase B
10
LFD
Out
Paper feed motor phase D
11
LFCOM
Out
Paper feed motor phases A & B common line
12
LFCOM
Out
Paper feed motor phases C & D common line
13
Gu
PTS sensor GND
14
M+5
Out
PTS sensor LED power (+5V DC)
15
MTS
In
PTS sensor timing signal
16
NC
Not used
17
Gl
PTS sensor shield
18
Gl
PTS sensor shield
NOTE: Signal direction is viewed from the control circuit board.
Table 2-9. CN8 Pin Assignment (PE Sensor)
Pin
Signal
Direction
Description
1
PE +
In
Paper end sensor + side (PE signal)
2
PE-
Paper end sensor- side (Logic ground)
NOTE: Signal direction is viewed from the control circuit board.
2-5
REV.-A
Table 2-1 0. CN1 Pin Assignment (COMI CN3)
Pin
Signal
Direction
Description
1
R0M1
ROM Vpp
2
R0M2
Out
A12
3
R0M3
Out
A7
4
R0M4
Out
A6
5
R0M5
Out
A5
6
R0M6
Out
A4
7
R0M7
Out
A3
8
R0M8
Out
A2
9
R0M9
Out
A1
10
ROM 10
Out
AO
11
ROM 11
In
DO
12
ROM 12
In
D1
13
ROM 13
In
D2
14
ROM 14
GND
15
ROM 15
In
D3
16
ROM 16
In
D4
17
ROM 17
In
D5
18
ROM 18
In
D6
19
ROM 19
In
D7
20
R0M20
Out
CE
21
R0M21
Out
A10
22
ROM22
Out
OE
23
R0M23
Out
All
24
R0M24
Out
A9
25
ROM25
Out
A8
26
ROM26
Out
A13
27
R0M27
Out
A14
28
ROM28
Out
Vcc+5V
NOTE: Signal direction is viewed from the CATX board.
w
^
Lj
2-6
r^
REV.-A
2.2 POWER SUPPLY CIRCUIT
The power supply circuit in the printer is diagrammed in Fig. 2-2; the circuit includes noise filter, transform-
er, and +24 and +5VDC regulator circuits, enabling the voltages listed in Table 2-11 to be output.
L
^ Vx (+5V DC)
CATXCircuit_Board __ _ _____ |
r^
Fig. 2-2. Power Supply Block Diagram
Table 2-1 1 . Power Supply Voltages
O
Voltage
Application
+24V
Carriage motor drive
Paper feed motor drive
Print solenoid drive
Optional interface circuit board voltage
+5V
(Vcc)
Logic circuit drive
Carriage motor holding voltage
Paper feed motor holding voltage
LED voltage
Optional interface circuit board voltage
+12V
Buzzer voltage
AC 12V
Not used
Vx(+5V)
Power reset
2-7
REV.-A
2.2.1 Filter Circuit (Fig. 2-3)
The CFIL filter circuit board assembly includes the fuse, power switch, and AC input cable. The AC line vol-
tage is filtered by C1 and M1 before being supplied to the transformer primary. The circuit also inhibits
outgoing noise to the power line.
u
220/240V Version
1 20V Version
Fl
SWl
CI
O.ImF
Ix.^
-0 L
Ml
SOOmH
-0 N
^
Fig. 2-3. CFIL Filter Board
2.2.2 Power Transformer (Fig. 2-4)
The power transformer converts the 1 20 or 220/240V AC input to approximately 1 0V AC and 28V AC, as
illustrated below.
PRIMARY SECONDARY
Black
AC120V
50/60 HZ
White
PRIMARY SECONDARY
oranoe
MU^^U V ''^
Brown
50/60
HZ
o-
Blue
Blue 10.7V
Purple 10.5V
Red
29.2V
^
NO LOAD VOLTAGE
Fig. 2-4. Power Transformer Windings
2-8
REV.-A
r^
2.2.3 Rectifier and Regulator Circuits
Two rectifier and regulator circuits, discussed in the following sections, are used to convert the 10V AC
and 28V AC from the transformer to +24 and +5 DC voltages for the motors and logic circuitry. Both use
"chopping" switching regulation, based on the principles illustrated in Figs. 2-5 and 2-6 and described in
the following text.
Basic Chopping Circuit
VIN
1^ Tr
L
ILOAD
1
0— -o-
D]
^ TJT-
IL
i
i
C-p VOUT
<
o
-J
T
\J ^ ■' ■ ■w w v^
I LOAD
VIN
Current Flow with Tr On
Current Flow with Tr Off
Fig. 2-5. Chopping Switching Regulator Operation
r^,
The transistor is turned on and off at a specified duty cycle. When the transistor is on (Ton), input voltage
(Vin) is supplied to L and C and load current IL flows. When the transistor is off (Toff), energy accumulated
in choke coil L is supplied to the load via diode D. The output voltage (Vout) can be expressed as follows,
and is maintained by varying Ton in accordance with changes in Vout:
r^
Vout = Vin X
Ton
Tr voltage between
Collector and Emitter
uo-v-i^t
Tr Emitter Current
D Current
Choke Coil Current
Ton : time Tr is on
Toff: time Tr is off
T : Ton + Toff
Ton
Toff
ni-
Diode D Current at
Backward Recovery
0— J
rdi r^
V i — V n
lL1=lL0-l- ; ^TON
-iLO-^t
T.n.ln (Vi-Vo)Vo
2Lf Vi
Fig. 2-6. Choke Input Filter Current Waveform
2-9
REV.-A
2.2.3.1 +24V Switching Regulator Operation
Voltage over 28V AC from the transformer secondary is applied to the +24V rectifier circuit (Fig. 2-7)
through bridge rectifier DB1, where it is full-wave rectified before being regulated at the 494 regulator at
8B. The +24V regulator circuit includes the 494, switching transistors, and a flywheel diode and choke in-
put filter.
vj
494 Regulator IC (Figs. 2-8 and 2-9)
Fig. 2-8 diagrams the internal circuitry of the 494; the operation of the 494 in relation to the +24V regu-
lator circuit is shown in Fig. 2-9.
ICs EA1 and EA2 are differential amplifiers. EA1 is used to detect the output voltage, which is deter-
mined by resistors R13, R14 and R15 (Fig. 2-9). EA2 is used to detect the output current, determined
by R60, R1 5, R6, R1 3, and R1 4, enabling an average 1 A current to flow. (Max. 4.4A)
The oscillation frequency is determined by CI 7 and R57, and is set at approximately 27KHz. The pulse-
width modulator (PWM) compares the outputs of EA1 and EA2 with the sawtooth wave from the oscilla-
tion circuit. The feedback terminal, pin 3, is used for phase correction; the dead time control terminal,
pin 4, uses the input voltage to control the transistors off time.
The output control terminal, pin 1 3, selects push/pull or parallel output. The Vref (Ref out) terminal, pin
1 4, outputs a +5V (± 0.25V) reference voltage.
Approximately 0.44V, divided by R1 4, R1 3, and R1 5, is input to the inverse terminal, pin 1 5, of EA2. If
no output voltage is generated, approximately 0.03V is input, equaling the resistance-divided +5V refer-
ence voltage from pin 1 4. R6 monitors the value of the load current at the non-inverse terminal, pin 1 6.
The overcurrent terminal operates when R6 receives approximately 4.4A.
The +5V reference voltage is input at the inverse terminal of differential amplifier EA1 via R61 . Approxi-
mately +5V is also input at the non-inverse terminal of EA1 , pinl , derived from +24V resistance-divided
by R1 3, R1 4, and R1 5. The accuracy of the output is determined by the accuracy of these reference vol-
tages.
u
28VAC
+40VDC (28VAC x n/2)
Q25 LD201-1R5NF
C3299(C3691) :i==l]
+24VDC
GND
+1 2VDC
GND
Fig. 2-7. +24V Regulator Circuit
^
2-10
REV.-A
r^
o
r^
Output Control
Ret out (U
GND (1
1
Reference
Regulator
Low Voltage
Stop
Dead Time (V)
Conrol jp
Non Inv. Input M^
Inv. Input ^2^
Non Inv .Input (Ts)
Inv .Input U5)
Feedback (3>
Hf-
osc
•^
Dead Time
COMPARATOR
EA1
EA2
PWM
COMPARATOR
Fig. 2-8. 494 IC Block Diagram
::ri3
^19 6K
I R 6
777. in
Load Current Return
Voltage Control
+40VDC
(28VACX/5-)
Current Limitation
-^(-T-+24VDC
Vcc
13
PUT / \
TROL I *—
OUTPUT
CONTROL
OSC
12
REF.
REG
GND
C17
0.0 1>J
C19
S^
CI
15
R57
4.3K
R15.
453n:
ir/o
O.lp
17VDC(/?'xH2VAC)
lUi"
16
R60
82K
T
U
C18
^H Hfc2iL|
,►0.1 jJ COUj"
R56
5.1K
R62 2
200K
— vw-
R61
2.2K
El
Y
^..
-SJ-
C22
O.ljj
R6
o.in
R13
19.6K
RU
4.6AK
■GND
Fig. 2-9. 494 IC and +24V Regulator Circuit
2-11
REV.-A
• Switching Transistors (Fig. 2-10)
Darlington transistors Q25 and Q27 increase the current amplification rate, operating in the following
sequence:
Control Pulse ON -> Q16 0N -^ Q27 ON -^ 025 ON
u
+40VDC
(28VxV2y
Q25
C3299(C3G93
+24VDC
Control Pulse -i j q q
R7
GND
Q16
C1815
CC945,C16853
Fig. 2-10. Switching Transistors Q25 and Q27
Flywheel Diode and Choice Input Filter (Fig. 2-1 1 )
Diode D8 in tiie +24V circuit is a flywheel diode. R8, C20, and D7 limit noise and maintain power effi-
ciency.
LD201-1R5NF
ERA84-009
C11DQ05)
D8 A
.C20
O.OlM
GND-
D7
ERB43-02
CDFB05B3
R8
5Gn IW
-Vo=+24VDC
^
C3
22 2200m
^ 35V
Fig. 2-1 1 . Flywheel Diode and Choke Input Filter
2.2.3.2 +5V Regulator Circuit (Fig. 2-1 2)
Voltage of approximately 10V AC from the transformer secondary is applied to DB2, where it is full-wave
rectified before being regulated by the regulator, SR1 , a 78L05A.
Rectified +14V DC ( V2"x 10) is input to the input terminal of the 78L05 via R51 as the bias current. The
input produces a +5V reference voltage, which is monitored by the output terminal and compared with the
voltage at the output side. If the voltage at the output side is lower than the reference voltage, Q26 turns
on until an upper voltage boundary is reached, at which point the transistor oscillates off and potential
again drops; when the voltage approaches the lower boundary, the process repeats.
Resistors R49 and R50 divide the resistance, causing approximately 60kHz of the oscillation frequency to
determine.
Capacitor CI 4 is used to quickly switch the output of transistor. Approximately 1 A may be supplied in this
circuit.
^
2-12
REV.-A
^
10VAC
IBABl
^
■C2
6800p
25V
Q26
A1307
(AlAAl)
80-50
"VT
R51
-wv—
51
78L05A
+5VDC
-GND
Fig. 2-12. +5V DC Regulator Circuit
r^
2.2.4 Vx Circuit
The Vx circuit is used during system reset and supplies a +5V pull-up voltage to the stepper motor. Zener
diode ZD2 is connected via R85 to the +24V line; ZD2 is biased at 4V, causing point A (Fig. 2-13) to be-
come 4V. Q1 1 turns on when 4.6V (the zener voltage plus the potential drop in sequential direction at the
PN junction) is supplied to its emitter. This circuit enables correct operation of the motor and efficient
system reset.
-1-5 V
Qll
-vw—
R39
lOK
(A)
R55
68
*
m
+ 2A
_ V X
Vsv)
ZD2
HZA A-2
R85
3.9 K
r^
Fig. 2-1 3. Vx Voltage Circuit
2-13
REV.-A
2.3 CATX CONTROL BOARD OPERATION
The operation of the CATX control board is diagrammed in Fig. 2-14; the board includes reset, data input
and decoding, carriage motor drive, paper feed motor drive, and printhead drive circuits.
U
CR
MOTOR
DRIVE
CIRCUIT
V
LF
MOTOR
DRIVE
CIRCUIT
c
7810
PA 3
PA2
PA 1
PAG
PB2
PB1
PBO
PC6
PC 2
PO
PF
ALE
HEAD
DRIVER
n
RAM
c
6116 cs
ADDRESS DATA BUS
n
ADDRESSCADS-ADIS)
V
ADDRESS
DECODER
(A8'^A15)
ADDRESS(AD0'vAD7)
^
ALE ADDRESS LATCH
DATA LATCH (I/O PORT)
STROBE BUSY IN INS IN6
7>
SLA
5040
COM
ADDRESS AB15
DEC0DER(A0^A7)
DATALATCH
PWD
MD1
HD9
A
V
:>
ROM
27256
CE
COMI
BOARD
Serial l/F
Parallel l/F
HOST
COM
ATN
SCLK
SDATA
DATA
•BUSY
-STROBE!
^
Fig. 2-14. Block Diagram
2.3.1 Reset Circuit (Fig. 2-1 5)
System reset occurs at power on, or upon receipt of the INIT signal from the host. Power on reset occurs
when the +5V from the Vx circuit is applied to the reset circuit; the 781 requires approximately 6 ^us to re-
set, the entire circuit requires approximately 47 ms. The RESET signal is output low for the time constant Z
= CR(S). D3 is used to discharge C5 when power is turned off, permitting the unit to be switched on and off
rapidly.
L^
2-14
REV.-A
n
O
r^.
Pin 4 of IC4C goes low when a low INIT signal is input at the interface connector, as in system or I/O reset
at the host. A filter circuit eliminates line noise, the Schmitt trigger modifies the wave, and the resulting
RESET signal is applied for the duration of INIT.
With RESET, the following initialization sequence occurs:
1 . The printhead moves to the left margin, home position.
2. The pointer position in the print buffer is rewritten.
3. DIP switch settings are made valid.
4. The software is initialized (default value of initalization is written to the working registers.)
5. If the printer is supplied with paper, the ON LINE/READY status is entered.
Vx
D3
1 52075
(MA165
Ik
R71
100
INIT — W*-
(From HOST)
R77
10K
-WV-
R26
47K
RA6
lOK
-VW-
C5
50V
JLc8
T1500P
AC
AC
13 J^^ 12
7J3C
H^
2C,
R5A
10K
— VW— " + 5
AC
RESET
(CPU)
RS
(To HOST)
Fig. 2-15. Reset Circuit
2.3.2 Decoding and Data Flow
2.3.2.1 Decoding
During decoding, the Mode 1 and Mode 2 terminals of the CPU are pulled high; the CPU is therefore able
to access the full, 64K-byte external memory.
The CPU outputs both address (ABO - AB7) and data (DBO - DB7) to ports PDO - PD7. The gate array uses
the ALE signal to separate the data of addresses; when ALE is high, addresses ABO - AB7 are output
from ports PDO - PD7 to ABO - AB7 of the SLA5040C0M, and are latched at the trailing edge of the ALE
signal. Addresses AB8 - AB1 5 are output to port PFO - PF7 of the 781 CPU.
For ROM, an individual memory position becomes active when PF7 is low, enabling logical addresses from
OOOOH to 7FFFH to be accessed.
For RAM accessing, PF7 is high and PF6 is low, causing addresses from 8000H to OBFFFH to be logically
accessible; however, the RAM size limits actual accesses to the 2k-byte range of OAOOOH to 0A7FFH.
The CPU uses memory mapping for I/O access from the SLA5040 COM. The SLA5040 COM uses AB1 5
as a chip select signal to enable the gate array: when PF7 is high and PF5 is low, logical addresses from
8000H to 9FFFH and OCOOOH to ODFFFH are accessible; however, only the 8000H to 8005H range is ac-
tually used as addresses ABO - AB7 are decoded by the SLA5040 COM.
2-15
REV.-A
+ 5
RM2-n
3.3 K
^S-
R65
3 3.K
AB15
SLA50A0 COM
1
p-o-
RAM
6H6_
CS
9"
A14CE
ROM
23256
KJcg
10
52
PF7
PF6
PF5
CPU
781
Fig. 2-1 6 Address Decoder Circuit
u
OOOOH
8000H
8005H
OAOOOH
OAOFFH
0A200H
0A783H
0A7FFH
OFFOOH
OFFFFH
PROGRAM
CHARACTER
GENERATOR
MEMORY MAPPED I/O
NOT USED
WORKING AREA
HORIZONTAL TAB (8BH)
VERTICAL TAB (23 H)
INPUT BUFFER (1 KBYTE)
LINE BUFFER (180 BYTE)
STACK AREA
NOT USE
DOWN LOAD BUFFER
ROM 32 KB
SLA 5040 COM
> EXTERNAL RAM 2 kB
BUILT IN RAM 256 Bytes
Fig. 2-17. Memory Map
^
O
2-16
REV.-A
r^
o
2.3.2.2 Data Flow with parallel interface
The 7810 main microprocessor is controlled by the program in the 32K-byte ROM on the COM! Board to
perform serial or parallel data transfer with the host. Data transfer between buffers is diagrammed in Fig.
2-18.
HOST COM:
HOST COM:
SLA5040COM:
SLA5040COM:
CPU7810:
CPU7810:
CPU7810:
Load the data on an interface data line
Set the STROBE signal to low
Latch the data in the gate array by the STROBE signal from host computer
Automatically output the BUSY signal to the host by the STROBE signal
Input of the STROBE signal is recognized by reading address
8X01 H 1 Recognized Not Recognized
Read the latched data in the SLA5040 COM by reading address 8X00H and automatical-
ly clear the BUSY signal output from the SLA5040 COM
Store the input data in the input buffer area ® and increment the pointer
Continue the above steps until either a CR-LF is received or the input buffer becomes full
CPU781 0: Set PB3 to high to forcibly output the BUSY signal (Output only at buffer full)
CPU781 0: Analyze the control codes (control characters) of the input buffer: if a download code is
received, the download data are transferred to the download buffer ®'; if a control code
is received, the data is set in the working area; if the data is not a control or downloard
code, the data (ASCII code) are stored in the line buffer®.
The carriage timing is omitted. (Refer to Section 2.3.5)
CPU781 0: Fetch one character from the line buffer and send the print data D7 ~ DO from the corre-
sponding character generator to the SLA5040 COM ®. (This is enabled by saving to ad-
dress 8X02H)
CPU781 0: Send print data D7 (pin 9 of HED) to the SLA5040 COM ®. (This is enabled by saving to
address 8X03H)
CPU7810: Setting PC6 to low causes PWD to be set low to output the data from HD1 - HD9ofthe
SLA5040 COM, and start the CPU built-in timer at the same time. (When setting PWD
to low, measure the voltage on the +24V line to determine the energizing pulse width)
CPU7810: Setting PC6 to high after the energizing pulise time passes causes PWD to be set high
with outputs HD1 - 9 of the SLA5040 COM set to low. (1 column of the character is
complete)
CPU781 0: New data are received as space becomes available in the input buffer®.
r^
®
NPUT BUFFER
1 kB
(D .
LINE BUFFER
180B
(D
HOST
COMPUTER
V///
® ,
©'
//
V////
/////
DOWN LOAD B
UFFER
/////
///
244B
V////
Fig. 2-18. Input and Download Buffering
2-17
REV.-A
2.3.3 Carriage Motor Control
The carriage motor control circuit is diagrammed in Fig. 2-1 9. This circuit uses unipolar drive with a direct
drive system by the CPU and a star connection as well in hardware. A two-two phase excitation method is
employed in software (Refer to Table 2-13), and the LS75 at 6B is a latch which buffers drive transistors
Ql 8 - Q20 while 1 G and 2G are high.
The pulse motor current drops due to reactance influence while rotating. However, no reactance influence
occurs when the pulse motor stops. The voltage output to the motor is changed corresponding to print
mode to maintain constant current during various motor states, as described in Table 2-1 2.
Table 2-1 2. Carriage Motor Voltages
Speed
Font
Voltage
Motor PPS
High speed
Low speed
Holding
Pica
Condensed
+24V
+17V
+5V
600 PPS
270 PPS
CPU
7810
PBO
PBl
PAO
PAl
10
ID IQ
rs
2D 2Q
6B 2Q
LS75
3D 3Q
3Q
AQ
2G
AD
IG
13
10
1 1
9
8
16
Vx
15
U
RM4
2.2Kx/»
-vw-
330xA D1630xA
-AV^
-vw
-wv
R35
R34
-AV^
-VW
R33
C 017
iC
■AVV t^ Q20
018
A phase B phose
019
— + 5
G P
C phase LDPhose^
D2
R86
15
^^^ GP
DA
RIO
-WW
+ 5
EM0lz5.6a
(ERA15-01, W03B
EMOIZ
KJ
(ERA15-01
DSAlAl)
W03B;DSA1A1)
ZD3
HZ18-2
/RD18J-B2 \
^ IMA4180-M/
Fig. 2-19. Carriage Control Circuit
Voltage is selected by the following sequence:
Pica: CPU PA2 goes low, IC2C pin 6 goes high, Ql 2 turns on, Ql 4 turns on, and +24V is output to
the motor.
Condensed: CPU PA3 goes low, Ql turns off, Q28 Vb = 1 8V, and +1 7V are output to the motor.
Holding: CPU PA2 and PA3 go high, IC2C pin 6 goes low and Ql turns on, Ql 2 turns off and Q28 Vb
= OV, Ql 4 turns off and Q28 Vc = OV, and +5V are output to the motor through the R1 and
D4.
"^
2-18
REV.-A
r^
The motor timing circuit is diagrammed in Fig. 2-20. As the motor rotates a corresponding motor-position
timing signal is generated by the PTS sensor beneath the motor (Refer to Fig. 2-21 ); this signal is fed back
into the CPU, where motor speed is monitored in a closed loop during acceleration and constant speed.
• At acceleration
When the timing signal is received before a set time has elapsed, the timing signal is ignored and the
phase is switched with the established timing. (Refer to Fig. 2-22 (a)).
If the PTS signal is received after the set period, the phase is switched in conjunction with receipt of
PTS. (Refer to Fig. 2-22 (b)).
A new set time is required for the next phase selection. The set time requires twelve kinds of time data
to correspond with each drive speed of 600 PPS and 270 PPS, as shown in Table 2-1 4 (a), to fetch each
of these for every phase selection.
• At constant speed
The following set time performs the closed loop control:
1 .67 ms ± ^0/Jsat 600 PPS
3.70 ms ± ^0 JUS at 270 PPS
• At deceleration
An open loop control is performed. The PTS signal from the printer mechanism and the set time are not
checked. The deceleration timing data performs phase selection in sequential order as shown in Table
2-1 4(b).
n
CPU
PCA
INT1
21
26
AC
'-^
+ 5
R74
-VW-
R75
15K
,p^ — C9 100K
'■^<^
390
P ^
-wv-
R d
C10T4 100K
R89 15K
VW I
+ 5
C26
O.lp
R87
1— WV-
200
^
-Ohome
15
1A
OPTS
OM + 5
13
17
18
OGl
OGl
OGl
/^^
Fig. 2-20. Carriage Motor Timing Circuit
NOTE: INT1 is a maskable interrupt input of the edge trigger (leading edge).
2-19
REV.-A
Table 2-13. Carriage Motor Drive Sequence
a) When driving the carriage from left to right (clockwise)
Step
A phase
B phase
C phase
D phase
1
ON
OFF
OFF
ON
2
ON
OFF
ON
OFF
3
OFF
ON
ON
OFF
4
OFF
ON
OFF
ON
b) When driving the carriage from right to left (counterclock-wise)
Step
A phase
B phase
C phase
D phase
1
ON
OFF
ON
OFF
2
ON
OFF
OFF
ON
3
OFF
ON
OFF
ON
4
OFF
ON
ON
OFF
^
Slotted disk
Stepper motor axis
^ PTS signal (To CPU INTl )
u
777" TTT
Fig. 2-21 . PTS Sensor Operation
^
2-20
REV.-A
a) Acceleration Time Data
O
Table 2-14. Carriage Time Data
b) Deceleration Time Data
Data No.
Set Time (ms)
600 PPS
270 PPS
1
4.50
5.50
2
3.30
4.70
3
2.70
4.20
4
2.30
3.91
5
2.10
3.80
6
2.00
3.70
7
1.95
3.70
8
1.92
3.70
9
1.90
3.70
10
1.85
3.70
11
1.80
3.70
12
1.76
3.70
Data No.
Set Time (ms)
600 PPS
270 PPS
1
1.68
3.70
2
1.72
3.70
3
1.76
3.70
4
1.84
3.70
5
2.00
3.70
6
2.12
3.70
7
2.28
3.70
8
2.48
3.80
9
2.80
3.91
10
3.20
4.20
11
3.52
4.70
12
4.00
5.50
o
Time Accuracy
±30/zs
Time Accuracy
±30a^
r^
2-21
REV.-A
Timing signal
(PTS)
Phase A
Phase B
Phase C
Phase D
A
Ignored pulse
Sn
Set time
u
(a) PTS occurs before the set time
Timing signal
(PTS)
Phase A
Phase b
Phase C
n
Phase D
Set time
(b) PTS occurs after the set time
Fig. 2-22. Closed Loop Operation
u
^
2-22
REV.-A
'^
2.3.4 Paper Feed Motor Control
The paper feed motor advances the platen a fixed increment by switching current at the drive coil for dir-
ect, uniploar drive.
The paper feed motor control circuit (Fig. 2-23) outputs two two-phase signals for drive, and the LS75 at
6B is a latch which buffers drive transistors Q21 - Q24 while 1 G and 2G and high. The stepper motor re-
quires current even in the halt state; therefore, the voltage is decreased to eliminate heat build-up, as de-
scribed below, when motor rotation stops.
The Commodore MPS-1000 performs acceleration and deceleration control. However, this control is not
used for less than 10 steps. Tables 2-15 through 2-18 describe paper feed motor timing, the drive se-
quence, and paper feed pitch.
o
CPU
781
PBO
PBl
PB2
Vx R37
i 2,2K C1815 C17A0
1(C9A5.C1685)
4^^
T
Vx
,1
2.2 KxA (D1637.DU91.D16A5)
f":l$^7 3 30 x^^Q 01630x8
A1020
(8112)
A phase I B phase
■--o-ajijjM-->Tnjjr^
fpOTORJ
phase I D phase I
-AW-
R6/.:
1.2K^
V —
T D 5 RV)
12
n
-I-2A
R4
5600
2W
180 1/2 W
EMOIZ '
/ERA15-0l\
W03B
\D5A1A1
+ 5
/^.
Fig. 2-23. Paper Feed Motor Control Circuit
Voltage Selection:
Stop -^ Rotation: CPU PB2 goes low, IC2C pin 2 goes high, Q1 3 turns on, Q1 5 turns on, and +24V is sup-
plied to the motor.
Rotation -^ Stop: CPU PB2 goes high, IC2C pin 2 goes low, Q1 3 turns off, Q1 5 turns off, and +5V is sup-
plied to the motor through R1 1 and D5.
2-23
REV.-A
Table 2-1 5. Acceleration Control
Step No.
Set Time
[ms]
tci
4.2
tC2
3.7
tC3
3.3
tC4
3.0
tC5
2.8
TIME Accuracy
+300/18
-50^
Table 2-1 6. Deceleration Control
Step No.
Set Time
[ms]
tDI
3.0
tD2
3.3
tD3
3.7
tD4
4.2
TIME Accuracy
+300 /IS
-50 /IS
u
Table 2-1 7. Paper Feed Motor Drive Sequence
Step No.
A phase
B phase
C phase
D phase
1
ON
OFF
ON
OFF
2
ON
OFF
OFF
ON
3
OFF
ON
OFF
ON
4
OFF
ON
ON
OFF
^
Table 2-18. Paper Feed Pitch
Paper Feed Pitch
Paper Feed Step
Paper Feed Time
0.12 mm (1/216")
1 pulse
4.23 mm (1/6")
36 pulses
124 ms
3.1 8 mm (1/8")
27 pulses
99 ms
2.82 mm (1/9")
24 pulses
90 ms
^
2-24
r^
o
REV.-A
2.3.5 Printhead Control
The PTS signal is used to time the firing location of the printhead as described in Fig. 2-24. Data output to
the printhead is described in Section 2.3.2 and printhead/carriage operation in Section 2.5.
PTS signal
Print solenoid 1
Print solenoid 2
Print solenoid 3
Print solenoid 4
Print solenoid 5
Print solenoid 6
Print solenoid 7
Print 1
Print 2
Print 3
Print 4
Print 5
Print 6
Print 7
JLOJU
1
1
1
1
1
:
lUULnJULILJLILJJl
1
"L
1
Print Solenoid drive pulse
1
1
t
t
t
Fig. 2-24. Print Timing
PTS signal
Drive pulse
1.67 nns (600 PTS)
\^ — >i
n.
n
-^ >
J L
430 JUS (at 24V)
n
'■^
Fig. 2-25. Energizing Pulse
2-25
REV.-A
2.3.6 Buzzer and PE Lamp Circuit (Fig. 2-26)
The buzzer receives an output pulse from the CPU at the buffer of the open collector. The buzzer drive vol-
tage is drived by the resistance dividing by the +12V DC non-stabilized power source. This prevents the
buzzer from riding on the +5V power.
The PE LED flickers according to by the signals from the paper end sensor.
u
To +1 2V DC Non-Stabilized Power
:2.2K
BUZZER O
-wv—
1.2 K
■oOo^
1+5V
3.3K
P E L P O
I
lOK
-Wr-
I
100
C PU
CPU
P E
ORE
Fig. 2-26. Buzzer and PE Circuit
2.3.7 AD Converter (Fig. 2-27)
The 7810 CPU has a built-in, 8-bit A-D converter and a multiplexer to enable input of eight lines, ANO to
AN7. AVcc and AVss supply power to the A-D converter; +24V is biased through R69 and +5V is ob-
tained at zener diode ZD1 . To determine the energizing pulse width, +24V is resistance divided by R1 6 and
R1 2 to input about 4.34V (at 24V) to ANO. Diode D1 is used to discharge CI 6 when the power is OFF;
R53 and CI 6 perform a simple sample holding; and C34 and C35 are decoupling capacitors.
The other analog input terminals are connected to the DIP switch and verify the DIP switch status when
power is turned on.
When the +24V line risis above 27.1V, the abnormal voltage is recognized, the carriage motor stops, and
the user is alerted of the condition by the buzzer.
u
5A
7810
AVCC
AVref
ANO
AVss
+ 2A
A3
A2
34
33
R69
3.3K
ZDl
IHZ5C-1-05
XC3/U_c
O.ljj
+ 2A
:35
'0.1>i
Dl
(MAI 65)^
.1S2075K^
i R53
2.2 K
VW— <
•016
'A70P
R16
8.25K
0.5%
R12
1.82K
0.5 %
777.
^
Fig. 2-27. AD Converter
2-26
REV.-A
O
r^
r^,
(US) 5QQ
+-«
■g
c
N
C
400
490
470
400
380
J \ L
J L
21.6 22 23 24 25 26 26.4 [VDC]
Drive voltage
Fig. 2-28. Relationship between Head Driver Voltage and Energizing Pulse Width
2-27
REV.-A
2.5 PRINTER MECHANISM OPERATION
The printer mechanism (Fig. 2-29) comprises the HOME POSITION (HP), PTS, and PAPER END (PE) sensors,
the carriage components, the platen assembly, the printhead, and the ribbon drive mechanism.
Paper end sensor
Home position sensor
u
Print timing sensor
Fig. 2-29. Printer Mechanism
2.5.1 Sensors (Fig. 2-30)
The home position (HP) sensor determines the left margin reference for print timing. The HP sensor assem-
bly is composed of a stationary sensor at the lower left of the mechanism and a sensor flag located on the
lower left of the carriage. The output signal goes high when the flag intercepts the optical axis of the pho-
tosensor.
The print timing signal (PTS) sensor outputs timing signals in relation to carriage motor rotation speed.
The PTS sensor is composed of a slotted disk, mounted on the motor shaft, and a sensor plate. The out-
put signal goes low when the slot of the sensor disk passes the optical axis of the photosensor.
The paper end (PE) sensor outputs a signal when the printer is out of paper. The PE assembly consists of a
lever on the paper guide and a microswitch; when no paper is present at the sensor, a continuity signal is
ouput.
^
©<
-O +5V
■O HP, PTS
-O GND
SP
Paper detection lever
Micro switch
^
Fig. 2-30. Sensor Operation
2-28
,^^
REV.-A
2.5.2 Carriage Mechanism (Fig. 2-31 )
The carriage is moved bidirectionally by the timing belt, driven via the driving pulley and the carriage mo-
tor. The components of the mechanism are shown below.
Carriage
Timing belt
Carriage motor
Carriage guide
Driving pulley
O
Fig. 2-31 . Carriage Mechanism
2.5.3 Paper Feed Mechanism (Figs. 2-32 and 2-33)
A friction platen is standard on the MPS-1 000; to use tractor feed paper, a detachable sprocket assembly
is available. Each of these assemblies operates in normal and high speed modes.
When using the friction platen (Fig. 2-32), paper is placed between the platen, paper feed rollers, and the
paper support roller. As the platen motor operates, the transmission gears rotate in the direction indicated
in the figure; paper is pressed against the platen by the rollers and advanced according to motor control.
The release lever frees the paper from the platen.
When the sprocket assembly is installed above the platen (Fig. 2-33), the sprocket gear interconnects with
the motor transmission gear assembly and the sprocket tractors are advanced accordingly. The paper sup-
port roller provides slight tension during paper feed, and the release lever should be in the open position.
r^.
2-29
REV.-A
U
Paper feed roller
Paper support roller
Platen gear
Paper feed motor
Fig. 2-32. Friction Feed Mechanism
u
Paper support roller
Sprocket gear
Platen motor
Platen gear
^
Fig. 2-33. Sprocket Feed Mechanism
2-30
REV.-A
r^
2.5.4 Printhead (Fig. 2-34)
When current flows to a drive coil, the electromagnent within the printhead causes the printhead pin to fire
and the wire strikes the ribbon; following energization, the actuator plate returns to its original position and
the wire is held in a wait state.
Dot wire
Wire reset spring
Stopper
Platen
Actuator plate
^Actuator plate spring
Fig. 2-34. Printhead Firing
O
r^,
2.5.5 Ribbon Drive IVIechanism (Fig. 2-35)
The components for ribbon drive are included in the drive gear assembly on the carriage and within the rib-
bon cartridge (Fig. 2-35). The gear configuration provides for counterclockwise revolution of the ribbon
drive gear and unidirectional ribbon movement. The ribbon braking spring improves spring tension.
Ribbon mask
Ribbon feed roller
Ribbon support
roller
Carriage
Ribbon transmission
gear
Ribbon drive
gear
Fig. 2-35. Ribbon Drive IVIechanism
2-31
REV.-A
CHAPTER 3
n OPTIONAL EQUIPMENT
n
n
Intentionally omitted at this time.
3-i
u
u
u
REV.-A
^
CHAPTER 4
DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT
4.1 GENERAL REPAIR INFORMATION 4-1
4.2 DISASSEMBLY AND ASSEMBLY 4-2
4.2.1 Upper Case Removal 4-2
4.2.2 COMI Board Removal 4-3
4.2.3 CATX Circuit Board Removal 4-3
4.2.4 Power Transformer Removal 4-4
4.2.5 Filter Circuit Board Removal 4-5
4.2.6 Printhead Removal 4-5
4.2.7 Head Cable Removal 4-6
/"^ 4.2.8 Home Position Sensor Removal 4-6
4.2.9 Paper End Sensor Removal 4-6
4.2.10 PTS Sensor Removal 4-7
4.2.1 1 Carriage Motor Removal 4-8
4.2.12 Paper Feed Motor Removal 4-8
4.2.13 Paper Feed Mechanism Removal 4-9
4.2.1 4 Paper Guide Auxiliary Removal 4-1 1
4.2.15 Timing Belt Removal 4-11
4.2.1 6 Printer Circuit Board Removal 4-1 2
4.2.17 Sprochet Unit Disassembly 4-13
4.3 ADJUSTMENT 4-16
4.3.1 Paper Feed Motor Backlash Adjustment 4-1 6
4.3.2 Carriage Motor Backlash Adjustment 4-16
4.3.3 Timing Belt Tension Adjustment 4-1 7
4.3.4 PTS Sensor Adjustment 4-18
4.3.5 Carriage Guide Plate Adjustment 4-1 8
4.3.6 Printhead Gap Adjustment 4-1 9
4-i
REV.-A
LIST OF FIGURES
Fig.
4-1
Fig.
4-2
Fig.
4-3
Fig.
4-4
Fig.
4-5
Fig.
4-6
Fig.
4-7
Fig.
4-8
Fig.
4-9
Fig.
4-10
Fig.
4-11
Fig.
4-12
Fig.
4-13
Fig.
4-14
Fig.
4-15
Fig.
4-16
Fig.
4-17
Fig.
4-18
Fig.
4-19
Fig.
4-20
Fig.
4-21
Fig.
4-22
Fig.
4-23
Fig.
4-24
Fig
4-25
Fig
4-26
Fig
4-27
Fig
4-28
Fig
4-29
Fig
4-30
Table 4-1
Table 4-2
Upper Case Removal 4-2
COMI Board Removal 4-3
CATX Circuit Board Removal 4-4
Power Transformer Removal 4-4
Filter Circuit Board Removal 4-5
Printhead and Head Cable Removal 4-5
Head Cable Set Removal 4-6
HP and PE Sensor Removal 4-7
PTS Sensor and Carriage Motor Removal 4-7
Paper Feed Motor Removal 4-8
Side Frame and Paper Support Roller Disassembly 4-9
Position of Hooks 4-1
Paper Feed Mechanism Removal 4-10
Timing Belt Removal 4-1 1
Printer Circuit Board Removal 4-1 2
Belt Tension Plate Removal 4-13
Leftside Plate Removal 4-13
Sprocket Set Removal 4-14
Sprocket Pinion Removal 4-14
Sprocket Set Disassembly 4-1 5
Wheel Positions 4-15
Paper Feed Motor Backlash Adjustment 4-16
Carriage Motor Backlash Adjustment 4-17
Tension Adjustment of Timing Belt 4-1 7
PTS Signal Synchronization 4-18
Position Adjustment of PTS Sensor 4-18
Carriage Guide Plate Position Adjustment 4-19
Ribbon Mask Removal 4-19
Platen Gap Adjustment 4-20
Platen Gap 4-20
LIST OF TABLES
Repair Tools 4-1
Measuring Instruments 4-1
^
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"U
4-ii
o
REV.-A
4.1 GENERAL REPAIR INFORMATION
This chapter describes how to remove the IVIPS-1000 main components for maintenance or repair. The
tools and measuring instruments listed in Tables 4-1 and 4-2 are recommended for use when disassem-
bling and/or repairing the printers.
Table 4-1. Repair Tools
•^
Tool
Type
Part No.
Vendor Part No.
Brush # 1
o
601162-28
B741 400200
Brush #2
o
601162-29
B741400100
Cleaning brush
o
601162-30
B741600100
Round nose pliers
o
601162-31
B740400100
Tweezers
o
601162-32
B741000100
Electric soldering iron
o
601162-33
B740200100
E-ring holder 3
o
601162-34
B740800500
E-ring holder 5
o
601162-35
B740800700
Phillips Screwdriver No. 1
o
601 1 62-36
B743800100
Phillips Screwdriver No. 2
o
601162-37
B743800200
Thickness gauge (0.65 mm)
©
601162-38
B776700601
Tension gauge (2000 g)
o
601162-39
B747700100
Box screwdriver (7 mm wide)
o
601162-40
B74 1700200
O = Commercially available
(D= EPSON exclusive tool
Table 4-2. Measuring Instruments
Name
Description
Class
Oscilloscope
50 MHz
A
Tester
A
Multimeter
B
Logic analyzer
B
A = Mandatory
B = Recommended
^^
4-1
REV.-A
4.2 DISASSEMBLY AND ASSEMBLY
The section describes removal of the main subassemblies of the printer. Component replacement is ac-
complished by reversing the removal procedure, noting any reassembly comments at the end of each
section.
^
4.2.1 Upper Case Removal (Fig. 4-1 )
1 . Remove paper from the printer.
2. Remove the platen knob.
3. Remove two screws ® from the upper case.
4. Lift the front edge of the case and move it backward until the control panel is exposed.
5. Remove the control panel (D from the upper case ®, then remove the upper case. (To remove the con-
trol panel depress the hook in the direction shown by the arrow).
u
"U
Fig. 4-1 . Upper Case Removal
4-2
r^
REV.-A
4.2.2 COMI Board Removal (Fig. 4-2)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Remove three screws ©, securing the COMI board.
3. Remove the screw (2), securing the Frame ground.
4. Lift the COMI Board to disconnect it from connectors CN3 and CN1 0.
O
Fig. 4-2. COMI Board Removal
4.2.3 CATX Circuit Board Remove (Fig. 4-3)
1 . Disconnect the power cord.
2. Remove the upper case. (Refer to Section 4.2.1 )
3. Remove the COMI board. (Refer to Section 4.2.2)
4. Disconnect connectors CN6, CN2, CN4, CN7, CN8, and CN5 from the CATX circuit board.
5. Release the five clamps © on the lower case and carefully remove the CATX circuit board.
4-3
REV.-A
-CN2
u
CN6 CN8 ® CN5 CN7 ® CN4
Fig. 4-3. CATX Circuit Board Removal
WARNING
When reinstalling the CATX board, verify that no connector wires are caught beneath it.
4.2.4 Power Transformer Removal (Fig. 4-4)
1 . Turn the power switch OFF, unplug the power cord from the power source, and disconnect the printer
from any peripheral device.
2. Remove the upper case. (Refer to 4.2.1)
3. Disconnect connector CN2 from the CATX circuit board.
4. Disconnect connector CN1 from the filter circuit board.
5. Remove two screws ® securing the power transformer (2), and carefully remove the transformer. (The
transformer auxiliary board may be removed at the same time).
CN2
^
^
Fig. 4-4. Power Transformer Removal
4-4
REV.-A
O
O
4.2.5 Filter Circuit Board Removal (Fig. 4-5)
1 . Turn the power switch OFF, unplug the power cord from the power source, and disconnect the printer
from any peripheral devices.
2. Remove the upper case. (Refer to Section 4.2.1 )
3. Disconnect connector CN1 from the filter circuit board.
4. Remove screw ©, which secures the A.C. ground wire.
5. Remove the clamp ® from the lower case which securies the filter circuit board (3), and carefully re-
move the board.
CN1
Fig. 4-5. Filter Circuit Board Removal
/^
4.2.6 Printhead Removal (Fig. 4-6)
1 . Remove the printer cover.
2. Remove screws ® from the printhead unit.
3. Lift the printhead ® straight up to remove.
Fig. 4-6. Printhead and Head Cable Removal
4-5
REV.-A
4.2.7 Head Cable Removal (Figs. 4-6 and 4-7)
1 . Remove the printer cover.
2. Remove the printhead. (Refer to Section 4.2.6)
3. Remove three screws ® from the cartridge base and remove the base ®. (Refer to Fig. 4-6)
4. Remove screws ® from head cable ®.
5. Remove connector ® of the head cable toward the front of the printer. Remove from dowel ® of the
carriage and lift.
6. Hold the plastic tabs on the head cable (marked with arrows) and pull to remove the cable from con-
nector ®.
^
^
Fig. 4-7. Head Cable Removal
4.2.8 Home Position Sensor Removal (Fig. 4-8)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Remove the COMI board. (Refer to Section 4.2.2)
3. Remove connector CN6 from the CATX circuit board.
4. Remove screw ® from HP sensor ® and carefully remove the sensor.
4.2.9 Paper End Sensor Removal (Fig. 4-8)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Remove the COMI board. (Refer to Section 4.2.2)
3. Remove the CATX circuit board. (Refer to Section 4.2.3)
4. Disconnect connector CN8 from the CATX circuit board.
5. Release hooks ® from the PE sensor unit ® and carefully remove the sensor.
"U
4-6
REV.-A
CN6 CN8 ®
r-\
O
(D ®
Fig. 4-8. HP and PE Sensor Removal
4.2.10 PTS Sensor Removal (Fig. 4-9)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Cut wire band © from the lead wires of the PTS sensor.
3. Disconnect connector CN7 from the CATX circuit board and remove the connectors for the PTS sen-
sor.
4. Release screw CD from PTS sensor ® and carefully remove the sensor.
NOTE: Following reassembly refer to section 4.3.4 and adjust the PTS sensor.
,'^
(D ® ® (D
Fig. 4-9. PTS Sensor and Carriage Motor Removal
4-7
REV.-A
4.2.1 1 Carriage Motor Removal (Fig. 4-9)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Cut wire band © from the lead wires of the carriage motor.
3. Disconnect connector CN7 from the CATX circuit board, and remove the connectors for the carriage
motor.
4. Remove screws ® from the carriage motor heat sink (5) and remove the heat sink.
5. Remove screws (D from the carriage motor ®, then carefully remove the motor.
NOTE: When mounting the carriage motor, the PTS sensor position must be adjusted (Section 4.3.4)
and the backlash between the carriage motor and the belt driven pulley must also be set (Section
4.3.2).
^
4.2.1 2 Paper Feed Motor Removal (Figs. 4-1 and 4-1 1 )
1 . Removal the upper case. (Refer to Section 4.2.1 )
2. Loosen the four fixing screws ® securing the left ® and right ® side frames.
3. Lift the side frames to remove.
4. Disconnect connector CN7 from the CATX circuit board and remove the connectors for the paper feed
motor.
5. Remove screws ®, which secure the paper feed motor ®, and carefully remove the motor. (Refer to
Fig. 4-11)
6. To disassemble the side frames/support roller, refer to Fig. 4-11.
NOTE: When the side frames and the paper feed motor are reassembled, verify that the operation of the
release lever is smooth, and adjust the backlash between the motor and the transmission gear.
(Refer to Section 4.3.1)
CN7
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Fig. 4-10. Paper Feed Motor Removal
^
4-8
REV.-A
o,
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Side frame
^Lset
Release lever
Flat surface must be positioned
toward the platen.
"Q
/
K
J30
f
L side must have a groove.
-<^Assembly Points^
Side frame
Rset
Fig. 4-1 1 . Side Frame and Paper Support Roller Disassembly
4.2.13 Paper Feed Mechanism Removal (Figs. 4-12 and 4-13)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Remove the side frames and paper support roller set. (Refer to Section 4.2.1 2)
3. Lift the platen unit.
4. Remove eight hooks ® from the back of the unit.
5. Lift the four paper feed roller spring guides (2) straight up to remove.
6. Slide the paper feed roller shaft ® in the direction of the arrow to remove. (The paper feed roller ® and
paper feed roller springs ® may be removed at the same time).
NOTE: When mounting the platen unit, the printhead gap must be properly adjusted. (Refer to Section
4.3.6)
r^
4-9
REV.-A
L^
Fig. 4-1 2. Position of Hooks
Fig. 4-13. Paper Feed Mechanism Removal
w
L^
4-10
o
REV.-A
4.2.14 Paper Guide Auxiliary Plate Removal (Fig. 4-13)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Remove the side frames and paper support roller set. (Refer to Section 4.2.1 2)
3. Remove the timing belt from the carriage (Refer to Section 4.2.1 5)
4. Remove two screws (6) from the carriage guide plate. Remove the carriage guide shaft ® and the car-
riage unit®.
5. Remove the paper guide auxiliary plate ®.
NOTE: When mounting the paper guide auxiliary plate, the position of the carriage guide plate must be
properly adjusted (Section 4.3.5) and the printhead gap must be set (Section 4.3.6).
4.2.15 Timing Belt Removal (Fig. 4-14)
1 . Remove the upper case. (Refer to Section 4.2.1 )
2. Remove two screws ® to remove carriage motor heat sink ®.
3. Remove the bottom cap ® from the rear side of the unit.
4. Place the carriage unit in the holes of the removed bottom cap, and remove timing belt ® from carriage
unit®.
5. Loosen screws ® on the belt tension plate and remove the timing belt.
NOTE: When assembling the timing belt, the tension must be properly adjusted (Section 4.3.3) and the
backlash between the carriage motor and the belt driven pulley must be set (Section 4.3.2).
O
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®
(D
Fig. 4-1 4. Timing Belt Removal
4-11
REV.-A
4.2.16 Printer Circuit Board Removal (Fig. 4-1 5 and 4-1 6)
1 . Remove the eight screws which secure the base plate from the rear side of the unit. (Refer to Fig. 4-1 2)
2. Remove the upper case. (Refer to Section 4.2.1 )
3. Remove the timing belt from the drive gear. (Refer to Section 4.2.1 5)
4. Remove screw ©from the lead wires on the carriage guide plate.
5. Remove head cable (2) from the connector.
6. Remove the side frames and paper support roller set. (Refer to Section 4.2.1 2)
7. Remove the two fixing screws ® to remove the carriage guide plate.
8. Remove the carriage guide shaft ®.
9. Remove screws ® to remove the carriage guide shaft holder.
1 0. Remove screws (D to remove the PF motor holder.
1 1 . Remove screws ® to remove the power transformer.
1 2. Remove the COMI board. (Refer to Section 4.2.2)
1 3. Remove the CATX circuit board.
1 4. Remove cable CN5 from the CATX circuit board.
1 5. Lift the lower case to remove it from the base plate.
1 6. Remove screw (D to remove printer circuit board plate (S). The belt tension plate ® may be removed
at the same time (Figure 4-1 6).
WARNING
When assembling the printer circuit board set, be sure no cables are caught beneath the
base plate when it is inserted into the lower case, or beneath the CATX circuit board when
it is installed.
NOTE: The timing belt must be properly adjusted after reassembly (Section 4.3.3), the backlash between
the carriage motor and the belt driven pulley must be set (Section 4.3.2), the position of the car-
riage guide plate must be verified (Section 4.3.5), and the printhead gap must be properly adjusted
(Section 4.3.6).
u
w
CN5
(3) (D d)
Fig. 4-1 5. Printer Circuit Board Removal
^
4-12
o
o
n
m
m
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REV.-A
Fig. 4-1 6. Belt Tension Plate Removal
4.2.1 7 Sprocket Unit Removal (Figs. 4-1 7 through 4-21 )
1. Depress the sprocket mounting levers, roll the sprocket assembly back, then slide the unit for-
ward to remove it from the printer.
2. Remove the side covers © from the left and right sides of the sprocket assembly.
3. Remove the four nuts (2) from the left and right sides.
4. Remove the E-ring ® from the left side, and remove the bearing ®.
5. Remove the left side plate (5).
6. Remove the sproket guide shaft (D.
7. Remove the sproket L set ®, the paper guide roller ®, the sproket R set (D, and the right side plate ®.
8. Remove the pin ®, and the pinion ©.
9. Disassemble the L and R sprocket sets (Refer to Fig. 4-20).
NOTE: When the sprocket unit is assembled, position the wheels as shown in Fig. 4-21 and make certain
the unit is horizontally aligned. (d
< Left side >
Fig. 4-1 7 Left Side Plate Removal
4-13
REV.-A
Fig. 4-1 8. Sprocket Set Removal
U
U
Fig. 4-19. Sprocket Pinion Removal
^
4-14
o
REV.-A
^
Fig. 4-20. Sprocket Set Disassembly
[Lside] [Rside]
//
ft
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Fig. 4-21 . Wheel Positions
4-15
REV.-A
4.3 ADJUSTMENT
When the paper feed motor or carriage motor, timing belt, PTS sensor unit, carriage guide plate, or platen is
removed from the printer, reinstallation requires adjustment according to the following procedures.
4.3.1 . Paper Feed Motor Backlash Adjustment (Fig. 4-22)
1 . Loosen the screws on the paper feed motor and move the motor so that the distance between the pap-
er feed motor shaft gear and the transmission gear is minimized but the gears do not bind.
2. Manually rotate the platen to verify operation of the assembly without slippage or binding.
3. When the adjustment is correct, tighten the screws.
u
Paper feed motor
Adjustment screws
Transmission gear
"U
Fig. 4-22. Paper Feed Motor Backlash Adjustment
4.3.2 Carriage Motor Backlash Adjustment (Fig. 4-23)
1 . Loosen the screws on the carriage motor heat sink.
2. Move the carriage motor manually to adjust the backlash so there is no slippage or binding when the
timing belt is moved manually back and forth.
3. When the adjustment is correct, tighten the screws.
^
4-16
REV.-A
r^
n
Screws
Carriage motor heat sink
Minimize backlash
Belt driven pulley
Fig. 4-23. Carriage IVIotor Baclclash Adjustment
0.03 - 0.15 mm
4.3.3 Timing Belt Tension Adjustment (Fig. 4-24)
1 . Loosen the screw on the belt tension plate.
2. Insert a tension gauge through the side frame and into the hole on the tension plate, then adjust the
plate position so that 1 500 ±50 gr tension is applied.
3. When the adjustment is correct, tighten the screw.
1 500 ± 50 gr
o
Screw
Fig. 4-24. Tension Adjustment of Timing Belt
4-17
REV.-A
4.3.4 PTS Sensor Adjustment (Figs. 4-25 and 4-26)
1 . Activate the printer and use a synchroscope to verify that the cycle (T) of the PTS signal is approxi-
mately the same in both directions.
If the waveform deviates from the permissible tolerance, perform step 2.
2. Insert a screwdriver through the hole used to secure the front cap (Refer to Fig. 4-26). Loosen the
screw securing the PTS sensor set.
3. Move the PTS sensor set in the direction shown by the arrow to perform the necessary adjustment.
4. Tighten the screw.
u
approx. 1 .67 ms
Fig. 4-25. PTS Signal Synchronization
u
PTS sensor set
Screw
Fig. 4-26. Position Adjustment of PTS Sensor
4.3.5 Carriage Guide Plate Adjustment (Fig. 4-27)
1 . Loosen the screw on the carriage guide plate.
2. Move the carriage guide until the tension between the ribbon transmission gear and the guide is maxi-
mized without binding. Slide the carriage assembly back and forth to test the adjustment along the
length of the platen.
3. When the adjustment is correct, tighten the screws, then verify the adjustment.
^
4-18
REV.-A
r^
r^
r^
Carriage unit Carriage Guide Plate Screw
-Ribbon transnnission gear
-Carriage guide plate
Fig. 4-27. Carriage Guide Plate Position Adjustment
4.3.6 Printhead Gap Adjustment (Figs. 4-28 through 4-30)
1 . Remove the ribbon mask (see Fig. 4-28).
2. Loosen the two screws on the ribbon mask guide.
3. IVIove the carriage to the middle of the platen and use a 0,65 mm feeler gauge to adjust the gap be-
tween the ribbon mask guide (and top wire of the printhead) and the platen.
4. When the adjustment is correct, tighten the screws, then verify the adjustment at the center and ends
of the carriage.
5. Verify the positions of the head holder and shaft holder according to Fig. 4-30.
6. Install the ribbon mask.
< Disassembling Points >
Ribbon nnask
Remove from support Remove from dowel Remove from support
Fig. 4-28. Ribbon Mask Removal
4-19
REV.-A
Ribbon mask guid§
Head holder
u
Platen
Fig. 4-29. Platen Gap Adjustment
*^ — 0.65 mm
Printhead
0^
(FtTsiJ
Keep the head holder in
contact with these
Head holder
Fig. 4-30. Platen Gap
^
^
4-20
REV.-A
CHAPTER 5
r^. TROUBLESHOOTING
5.1 TROUBLESHOOTING PROCEDURE 5-1
5.2 PROBLEM DIAGNOSIS BY SYMPTOM 5-3
5.3 DIAGNOSIS BY COMPONENT EVALUATION 5-1 1
5.4 PROBLEM DIAGNOSIS BY CIRCUIT EVALUATION 5-22
5.4.1 Troubleshooting the CATX circuit Board 5-22
5.4.2 Troubleshooting the Printer Mechanism 5-41
LIST OF FIGURES
Fig. 5-1 Printhead Cable Diagram 5-7
Fig. 5-2 PC6 (pin 23) Waveform 5-24
Fig. 5-3 Base Voltage Waveform of Print Solenoid Driver
Transistor 5-25
Fig. 5-4 Collector Voltage Waveform of Print Solenoid Driver
Transistor 5-25
Fig. 5-5 PAO and PA1 Voltage Waveform 5-27
Fig. 5-6 CR Motor Switching Transistor Voltage Waveform 5-27
Fig. 5-7 LF Motor Switching Transistor Voltage Waveform 5-31
Fig. 5-8 CT Waveform 5-37
Fig. 5-9 El Waveform 5-37
Fig. 5-1 Q1 6 Collector Waveform 5-37
Fig. 5-1 1 Q25 Base Voltage Waveform 5-38
Fig. 5-1 2 Normal PTS Signal 5-40
LIST OF TABLES
Table 5-1 Replacement Parts 5-2
Table 5-2 Troubleshooting Tools 5-2
Table 5-3 Power Transformer Winding Resistance 5-4
Table 5-4 Printhead Resistance 5-7
Table 5-5 Troubleshooting the Printer Mechanism 5-42
o
r-)
5-i
(^
REV.-A
5.1 TROUBLESHOOTING PROCEDURE
When followed in order of presentation, the problem evaluation procedures outlined below are felt to be
the most efficient method for isolating a defective component. Once the malfunctioning component is
identified, refer to the Disassembly Assembly and Adjustment section for repair/replacement instructions,
and to Table 5-1 for replacement part numbers.
1 . Problem Diagnosis By Symptom
Procedure: Symptom diagnosis by evaluation of printer malfunction signals; procedures performed with
aid of tester or multimeter, as required. (No use of oscilloscope or synchroscope.)
NOTE: If problem diagnosis is performed by replacing the defective unit without testing with an os-
cilloscope or synchroscope, be sure to verify that the replacement component is not defec-
tive.
Level: Requires a thorough familiarity with printers and their principles of operation.
2. Diagnosis By Component Evaluation
Procedure: Component evaluation by inspection and/or component exchange.
Multimeter or tester used as required.
Level: Requires a thorough familiarity with printers and their principles of operation.
3. Problem Diagnosis by Circuit Evaluation
Procedure: Circuit evaluation using an oscilloscope to identify deviant waveforms.
Level: Requires a high-degree of electronics knowledge.
WARNING
f""^^ Perform each check item which appears on the troubleshooting flow chart.
When a unit or a component part is replaced without following this procedure,
the replacement unit or component may be damaged again in the same man-
ner.
NOTE: If you become caught in a loop or lose track of your position in a flowchart, return to the begin-
ning and start again.
■^
5-1
REV.-A
Table 5-1 . Replacement Parts
Component
Part Number
Filter Circuit Board (CFIL) 1 20V
Y560202500
Filter Circuit Board (CFIL) 220/240V
Y560202200
CATX Circuit Board (For 1 20V and 240V Version)
Y560201400
CATX Circuit Board (For 220V Version)
Y560201500
MainCPU(juPD7810G)
X400078100
23256 EPROM
Control Panel (COMPNL)
Y563501000
61 16 SRAM
X400161164
Regulator IC (494)
X440034940
Fused A) 120V
X502040040
Fuse(315mA)220/240V
X5020 15010
Power Transformer (CT-P8RU-1 ) 1 20V
Y435501800
Power Transformer (CT-P8RE-1 ) 220V/240V
Y435501600
Power Transformer (CT-P8RE-1 ) 240V/220V
Y435501700
COMI Circuit Board
Y561201800
Reed Switch (P.E. Sensor)
F322151000
PTS Sensor Board Assembly
F322054000
HP Sensor Board Assembly
F322 154000
Carriage Motor
F322052000
Paper Feed Motor
F322003000
Printhead
F406 100000
u
v^
Table 5-2. Troubleshooting Tools
Item
Description
Part No.
Vendor Part No.
Cable #938
Extension between CATX Board and COMI Board
26 pins
601162-41
Y42232000
Cable #E503
Extension between CATX Board and COMI Board
28 pins
601162-42
B765101501
^
5-2
REV.-A
5.2 PROBLEM DIAGNOSIS BY SYMPTOM
This section addresses those symptoms which are clear indicators of a particular component malfunction.
/"^ Problem indicators are discussed as follows:
Printer Does Not Operate with Power Switch ON
• Carriage does not move.
• No indicator on the control panel lights.
Abnormal Carriage Operation
• Carriage moves away from home position at power ON.
• Although the carriage returns to the home position, the printer does not enter READY mode.
Incorrect Printing (in self-test) with Normal Carriage Operation
• No printing is executed.
• Some dots do not appear.
Incorrect Color Printing
• Specified color is not printed.
Abnormal Paper Feed
• No paper is fed.
• Separation between lines varies with irregular paper feed.
Abnormal Operation of Control Panel
• No paper is fed (by operation of the LF or FF switch) in OFF-LINE mode.
• No operation mode is set from the control panel.
• ON-LINE or OFF-LINE mode is not obtained.
Incorrect Printing in ON-LINE Mode
• Carriage operates normally at power ON and the result of the self-test is correct. However, the print data
from the computer is not output normally.
o
.^
5-3
REV.-A
(1 ) Printer Does Not Operate With Power Switch ON
^
Use correct AC
input voltage.
Measure the primary and se-
condary winding resistances
of the power transformer.
(Table 5-3)
Replace the CATX
circuit board.
^
Replace the power
Transformer and the
CATX board.
\end/
Replace the CATX circuit
board.
Replace the CFIL
filter circuit
board.
Table 5-3. Power Transformer Winding Resistance
V
Tester leads
Resistance value
Transformer
©
e
120V
220V
240V
Primary windings
(CFIL Board Side)
120V
White
Gray
^3Q
44^
4913
220V
Blue
brown
240V
Blue
Orange
Secondary windings
Red
Red
0.8^
Purple
Purple
0.4/2
(CATX Board Side)
Blue
Blue
MQ
w
5-4
REV.-A
(2) Abnormal Operation Of Carriage
c
Start 2
)
Replace the CATX
circuit board.
V
Replace the printer
mechanism.
\end/
5-5
REV.-A
(3) Incorrect Printing (in self-test) With Normal Carriage Operation
c
Starts
)
Perform self-test.
Measure the printhead
resistance. (Table 5-4)
Replace the printhead.
V
^
Are the
•printhead connector*"
and the connector bet-
ween the printer mechanism
and CATX circuit board
correctly connected
^ with no contact
^failure? ^
Replace the CATX circuit
board
Replace the CATX
board.
Reinsert them correctly
Is
^
the fault corrected?
\end/
V
W
5-6
REV.-A
r^
r^
MM IIMI
O #1
O #2
0#3
O #4
0#5
O #6
O #7
0#8
0#9
< Wire assignment >
Fig. 5-1 . Printhead Cable Diagram
Table 5-4. Printhead Resistance
Test Leads
Resistance value
Positive lead
Negative lead ©
Common line
Each dot wire
Approx. 22 ohms
r^
5-7
REV.-A
(4) Abnormal Paper Feed (with normal printing)
U
C
Start 4
3
Set the paper
correctly.
Does the
paper feed knob
rotate smoothly when
turned manually with
power OFF?
Replace the printer
mechanism.
Replace the CATX
circuit board.
Lj
Is fault corrected?
\end/
Replace the printer
mechanism.
^
5-8
REV.-A
(5) Abnormal Operation Of Control Panel
r^
c
Starts
O
)
"the corrector between^ ^
the control panel and the"
^CATX board connected
correctly?^
Replace the
control panel.
ENDy
Reinsert it
correctly
Replace the CATX
circuit board ?
Vend/
Replace the
control panel.
Replace the CATX
circuit board?
V
V
5-9
REV.-A
(6) Incorrect Printing In ON-LINE Mode
NOTE: It is assumed that the host computer operates normally.
c
u
Starts
J
Perform self-test.
Refer to other
troubleshooting items.
Replace the connection
cable from host to
computer.
^
\END/
Replace the CATX circuit
board.
V
^
5-10
REV.-A
5.3 DIAGNOSIS BY COMPONENT EVALUATION
r^
c
Initial
3
Turn the power OFF.
Disconnect the interface ca-
ble from the printer side.
Remove the cartridge ribbon.
Move the carriage to center
of printer.
Set paper.
n
r^.
5-11
REV.-A
Perform the self-test.
Turn the power OFF
after printing several
lines.
Attach the cartridge
ribbon to the
printer.
< Self-print test >
To activate the printer self-test:
a) Turn the power switch OFF.
b) While depressing the line feed (LF) switch,
turn the power switch ON.
u
e
e
^
"u
5-12
REV.-A
n\
r^.
r>
Press the FF switch and LF
switch alternately several
times.
Press the ON-LINE switch
once.
Press the LF switch
several times.
Press the FF switch once.
Turn the power OFF.
• Connect the interface
cable.
• Turn the power ON.
e
e
Give the print instruction
from host computer to
execute printing
e
5-13
REV.-A
Carriage Does Not Return to Home Position at Power ON
^
Turn the
power OFF.
Replace the printer
mechanism.
Insert the paper and
turn the power ON
again.
Turn the power OFF, then
check by continuity test
that the PE (out of paper)
sensor switch operates
normally
Replace the PE
sensor.
Replace the CATX
circuit board.
Replace the carriage
motor.
C
Go back to
Initial
)
o
Turn the
power OFF.
Measure the resistances of
the carriage motor coils.
1 . Disconnect connector
CN7.
2. Measure the resistances
at CN7 on the printer me-
chanism side.
A phase: Between pin 6
and pin 1.
B phase: Between pin 6
and pin 3.
C phase: Between pin 5
and pin 2.
D phase: Between pin 5
and pin 4.*
3. Each measurement value
should be about 54^.
u
Replace the CATX
circuit board.
\ END/
^
5-14
REV.-A
Carriage Does Not Move
No DC Voltage Appears
O
Measure the DC voltages on
the CATX circuit board.
NOTE: No terminal for mea-
suring voltages is
provided on the
CATX circuit board.
Please use the IC
Vcc, etc.
O
Turn the
power OFF.
Measure AC voltages.
1 . Turn the power ON.
2. Measure AC voltages
at CN2 on CATX cir-
cuit board.
Blue 10.7V
Purple 10.5V
Red 29.2V
3. After measurement,
turn the power OFF.
Turn the
power OFF
Check all cable con-
nectors in the printer
for contact failure.
Check the fuse In
the filter circuit for
connection.
Replace the CATX
circuit board.
Replace the CATX
circuit board.
Reinsert them
correctly.
r^
Replace the printer
mechanism.
Replace
the fuse.
END,
Check that the printer
power supply meets the rat-
ings. Measure AC voltage.
Go back to
Intial.
)
5-15
REV.-A
Power Is Not Supplied to Some Part No Power Is Supplied at All
Fuse Is Blown
o
Turn the
power OFF.
Check the resistances of the
transformer windings.
1. Disconnect connector
CN2.
2. Check the resistances at
CN2 on secondary the
side of transformer.
3. Check the resistance of
the primary winding with
the filter circuit board
connector disconnected.
* Reference values
Primary winding:
Approx. 9.7i3
Secondary windings:
Red 1 .312
Purple 1 .OQ
Blue 1 8.912
u
Turn the
power ON.
Use a correct
power supply.
Go back to
Initial.
J
Replace the
transformer
Replace the CATX
circuit board.
Reconnect the connector
of filter circuit and
connector CN2.
Disconnect connector
CN2.
2. Check the resistances at
CN2 on the secondary
side of the transformer.
3. Check the resistance of
the primary winding with
the filter circuit board
connector disconnected.
* Reference values
Primary winding:
Approx. 9.7^
Secondary windings:
Red 1 3Q
Purple 1 .OQ
Blue 18.912
u
Replace the transform-
er and fuse.
Replace the filter
circuit board.
Go back to
Initial.
3
^
5-16
REV.-A
Power Feed Motor Does Not Operate
r^
o
Turn the power OFF.
r^
To measure the coil resis-
tances of the paper feed mo-
tor:
1. Disconnect connector
CN7.
2. Measure the resistances
at CN7 from the printer
mechanism side.
Between pins 1 1 and 7
(phase A).
Between pins 1 1 and 9
(phase B).
Between pins 1 2 and 8
(phase C).
Between pins 1 2 and 1
(phase D).
3. Each resistance value
should be approx. 46
ohms.
Replace the CATX
circuit board.
Vend /
Indication on Control
Panel is Incorrect.
Turn the power OFF.
Repair the connector
pin or replace the con-
nector cable.
Replace the control
panel.
Replace the paper
feed motor.
r>,
C
Replace the CATX
circuit board.
\end/
Go back to Initial.
)
\ END/
5-17
REV.-A
Buzzer or Abnormal Sound is Generated. Carriage Does not Move at Self Test. No.1
Disconnect the
control panel con-
nector.
Replace the CATX
circuit board.
C
Go back to Initial
o
Replace the printer
mechanism.
Power OFF
Replace the control
panel.
Repair the connector pin or
replace the connector cable.
Replace the
control panel.
U
^
©
Lj
5-18
REV.-A
^^
O
O
Carriage Does not Move at Self Test
No. 2
Paper Feed is not normal
Measure the resistances of
the carriage motor coils.
1. Disconnect connector
CN7.
2. Measure the resistances
at CN7 on the printer me-
chanism side.
A phase:
Between pin 6 and pin 1
B phase:
Between pin 6 and pin 3
C phase:
Between pin 5 and pin 2
D phase:
Between pin 5 and pin 4
3. Each measurement value
shoud be about 54^.
Replace the
carriage motor.
Replace the CATX
circuit board.
Turn the power OFF.
Measure the coil resistances
of the paper feed motor:
1. Disconnect connector
CN7.
2. Measure the resistances
at CN7 from the printer
mechanism side.
Between pins 1 1 and 7
(phase A).
Between pins 1 1 and 9
(phase B).
Between pins 1 2 and 8
(phase C).
Between pins 1 2 and 1
(phase D).
3. Each resistance value
should be approx. 46
ohms.
Replace the CATX
circuit board.
\end/
Replace the carriage
motor.
C
Go back to Initial
itial. j
5-19
REV.-A
Printing Is Incorrect
Switches on Control Panel Function in ON-LINE Mode
Turn the power OFF.
Measure the resistances of
printhead coils.
1. Disconnect the head
connector.
(RefertoFig.5-1.)
2. Measure the resis-
tances.
Each resistance value
should be approx. 22
ohms.
Check the printhead dot
Turn the power OFF and
replace the CATX circuit
board.
Perform the self test.
Turn the power OFF.
Replace the CATX cir-
cuit board.
Replace the printhead.
Perform the self test.
Go back to Initial
3
Turn the power OFF and
replace the control panel.
Go back to Initai.
3
Vend/
"U
u
^
5-20
LF and FF Switches Do Not Operate in OFF-LINE Operation is Incorrect With Host Computer Connected.
REV.-A
^^
O
Turn the power OFF.
Turn the power OFF.
Replace the CATX cir-
cuit board.
Replace the interface
cable.
Vend/
Turn the power OFF
and replace the control
panel.
Vend/
Turn the power OFF.
Replace the CATX circuit
board.
\end/
c
Go back to Initial
o
Check the host side.
\end/
o
5-21
REV.-A
5.4 PROBLEM DIAGNOSIS BY CIRCUIT EVALUATION
5.4.1 Troubleshooting the CATX Circuit Board
The following test procedures require use of an oscilloscope or a synchroscope.
'•U
Go to "Carriage Start
)
Go to "Carriage Start
2"
3
^
^
5-22
REV.-A
-'^
r^
n
5-23
REV.-A
W
Press the "LF" switch
and turn the power on
simuiationeously.
If the self-test is not
generated, check the-
control panel.
Observe the waveform
from PDO (pin 55) to
PD7 (pin 62), ALE (pin
46), PC6 (pin 23) and
WR (pin 45) of the
7810 CPU.
u
0.2ms/div 1V/div
Fig. 5-2 PC 6 (pin 23) Waveform
Observe the waveform
from AB1 5 (pin 36)
oftheSLA5040C0M
Replace the ROM
and RAM.
V
KJ
5-24
REV.-A
O
O
.^^>
Observe the wave-
forms from HD1 to
HD9 (pins 1,2,3,4,
41,40, 9, 38, and 37)
of SLA5040 COM
^
Observe the base and
collector waveforms of
print solenoid drive
transistors 01 to 09
-I — I — I — I — I — r
0.5V/div 0,2ms/div
Fig. 5-3.
Base Voltage Waveform of
Print Solenoid Driver Transistor
T r' — I 1 1 1 1 1 — 1 1
lOV/div 0.2ms/div
Fig. 5-4.
Collector Voltage Waveform of
Print Solenoid Drive
Transistor.
Disconnect the print-
head and measure the
resistance value of the
solenoid. Aprox. 22
ohms should be present.
(Fig. 5-1)
V
Observe waveform
from pin 1 1 of IC3C
Replace IC3C
Replace the
SLA5040
COMatlCIA
Observe the waveform
from pins 4 and 1 of
IC2C
Base resistance open.
Replace defective re-
sistance.
R84, 83, 82, 81, 80, 67,
79, 66, 78
NOTE: CN5 and F.P.C
(flat plastic cable) are
not open or loose.
5-25
REV.-A
U
Replace the printhead
Replace the defective
transistor
"U
^
5-26
REV.-A
O
O
^^
c
Carriage Start 1
J
NOTE: Set in the pica
mode by turning
DIP SW 1-1 and
1 -2 OFF
Perform self test in
pica mode.
Observe the waveform
from PAO (pin 1 ) and
PA1 (pin 2) of
CPU7810
I
PAO
n
Check the following
points prior to entering
this flow chart:
® DC Voltages
® PTS Signal
® HOME Signal
® A-D Converter
PA1
Alternately
2ms/div 2\//dlv
Fig. 5-5. PAO and PA1 Voltage Waveform
Replace the ROM
and RAM.
Observe the wavef rom
from 30 (pin 1 ), 30
(pin 16), 40 (pin 15)
and 40 (pin 1 4) of
IC6B.
Replace the 781 OCPU.
Replace iC6B.
Measure the resis-
tance value of RM4
common ... pin 1 ap-
prox. 1 .9 kohms
Observe base voltage
waveforms of CR mo-
tor dirve transistors
01 7 ~ 020.
^
EN^>
in,.n
IV/div
•n^ — r I
20V/div
2ms/div
Fig. 5-6.
CR Motor Switching
Transistor Collector
Voltge Waveform (Lower).
Base Voltage Waveform (Upper).
5-27
REV.-A
U
Base bias resistance open
Replace defective resis-
tors R32 ~ R35
i/leasure the voltage level at
the + side of diode
02 or D4
NOTE: +24: When car-
riage moves.
+5V: When car-
riage stops.
Observe waveforms
from pin 6 of IC2C
Observe collector voltage
waveforms of CR motor
drive transistors 01 7 ~
020.
NOTE: CR motor coils are
not open. When
open, no collector
voltages appear.
Resistance of CR
motor coils is
approx. 54
ohms.
Replace the defec-
tive transistor
V
Replace IC2C.
w
Replace the defec-
tive transistor.
Replace diode D4.
Replace 781 OCPU
(IC5A).
V
^
5-28
REV.-A
Carriage Does Not Move
No DC Voltage Appears
r^
Measure the DC voltages on
the CATX circuit board.
NOTE: No terminal for mea-
suring voltages is
provided on the
CATX circuit board.
Please use the IC
Vcc, etc.
r^
Turn the
power OFF.
Measure AC voltages.
3.
Turn the power ON.
Measure AC voltages
at CN2 on CATX cir-
cuit board.
Blue 10.7V
Purple 10.5V
Red 29.2V
After measurement,
turn the power OFF.
Turn the
power OFF
Check all cable con-
nectors in the printer
for contact failure.
Check the fuse in
the filter circuit for
connection.
Replace the CATX
circuit board.
Replace the CATX
circuit board.
Reinsert them
correctly.
r^
Replace the printer
mechanism.
Replace
the fuse.
END,
Check that the printer
power supply meets the rat-
ings. Measure AC voltage.
Go back to
Intial.
3
5-15
REV.-A
Power Is Not Supplied to Some Part No Power Is Supplied at All
Fuse Is Blown
o
Turn the
power OFF.
Check the resistances of the
transfornner windings.
1. Disconnect connector
CN2.
2. Check the resistances at
CN2 on secondary the
side of transformer.
3. Check the resistance of
the primary winding with
the filter circuit board
connector disconnected.
* Reference values
Primary winding:
Approx. 9.712
Secondary windings:
Red 1 .3Q
Purple 1 .0^2
Blue 1 8.9/2
^
Replace the filter cir-
cuit
CFIL board.
Turn the
power ON.
Use a correct
power supply.
Replace the
transformer
Replace the CATX
circuit board.
Reconnect the connector
of filter circuit and
connector CN2.
Turn the
power OFF.
I
Go back to
Initial.
J
1. Disconnect connector
CN2.
2. Check the resistances at
CN2 on the secondary
side of the transformer.
3. Check the resistance of
the primary winding with
the filter circuit board
connector disconnected.
* Reference values
Primary winding:
Approx. 9.712
Secondary windings:
Red 1 .3X2
Purple 1 .OjQ
Blue 1 8.9;Q
Replace the transform-
er and fuse.
^
Replace the filter
circuit board.
Go back to
Initial.
3
Lj
5-16
REV.-A
Power Feed Motor Does Not Operate
Indication on Control
Panel is Incorrect.
r^
o
o
Turn the power OFF.
Turn the power OFF.
To measure the coil resis-
tances of the paper feed mo-
tor:
1 . Disconnect connector
CN7.
2. Measure the resistances
at CN7 from the printer
mechanism side.
Between pins 1 1 and 7
(phase A).
Between pins 1 1 and 9
(phase B).
Between pins 1 2 and 8
(phase C).
Between pins 1 2 and 1
(phase D).
3. Each resistance value
should be approx. 46
ohms.
O
^^'^ Is resistance at ^"v,^^^
N
^...^ 46 ohms? ^
Yj
Replace the CATX
circuit board.
Replace the paper
feed motor.
Repair the connector
pin or replace the con-
nector cable.
Replace the control
panel.
O
Replace the CATX
circuit board.
\end/
\ END/
5-17
REV.-A
Buzzer or Abnormal Sound is Generated. Carriage Does not Move at Self Test. No.1
Disconnect the
control panel con-
nector.
Replace the CATX
circuit board.
C
Go back to Initial
o
u
Replace the printer
mechanism.
Power OFF
Replace the control
panel.
Repair the connector pin or
replace the connector cable.
Lj
^
5-18
REV.-A
'^
c
Carriage Start 2
,^
)
Perform the self
test in condensed
mode.
Measure voltage level
at + side of diode D2
orD4.
NOTE: Set in the condensed
mode by turning DIP
Switch 1-1 on and DIP
switch 1 -2 off.
NOTE: +5V: When carriage
stops
+16: When carriage
moves
Measure voltage level
at © side of zener
diode ZD3
NOTE: +18V: When carriage
moves
OV: When carriage
stops
Replace Q10
Measure voltage level
at emitter of Q28
NOTE: +1 7V: When carriage
moves
OV: When carriage
stops
Replace Q28
Check D2 with a tester
for normal operation.
■•^
5-29
REV.-A
V
Is
D2
normal ?
Replace D2 and Q28
NOTE: Replace both because
D2 prevents reverse vol-
tage to Q28
V
u
5-30
REV.-A
r^
c
Paper Feed Start
r^
o
3
Check the following
points prior to entering
this flow chart:
® DC voltage
® A-D converter
Observe the waveform
form PBO (pin 9) and,
RBI (pin 10) of 78 10
CPU during paper feeding
by turning the paper
feed switch on.
(Same as Fig. 5-5)
Replace ROM and
RAM.
1V/div
20V/div
Check 01 3 and 01 5
for normal operation
V
2ms/div
Fig. 5-7.
LF Motor Switching
Transistor Base
Voltage Waveform (Upper)
Collector Voltage Waveform (Lower)
at FF switch ON.
5-31
REV.-A
V
^
NOTE: No collector
voltages appear
when open. Re-
sistance of LF
colls is approx.
46 ohms
Observe the waveform
from paper feed drive
transistors 021 ~
024 during paper
feeding by turning the
paper feed switch on.
Replace the
defective tran-
sistor.
Replace D5.
^
Replace the de-
fective transistor.
Replace the
7810CPUat
5A.
V
^
5-32
REV.-A
r^
o
o
c
Interface Start
)
Observed the wave-
form from pin 1 of
IC4C.
Observe the waveform
from pin 1 of 7A
Observe the wave-
form from pin 6 of 3C
Replace the SLA5040
COM (1 CI A).
Replace the 7810
(1C5A).
V
^^•.^^ lost? ^^^^ [^x^
Replace IC4C
Replace IC7A
Replace IC3C
Observe the waveform
from pins 10 and 4 of
IC2C.
Observe the waveform
from pin 1 1 of IC3C.
Replace 1 C2C.
Replace 1 CSC.
5-33
REV.-A
c
Power Start
+24VDC
^
Check AC voltage out-
put at connector CN2.
Blue 10V
Purple 10V
Red 28V
Check resistance val-
ues of transformer
colls
Check if fuse or coil on
CFIL circuit board is
opened.
^
Replace
the transformer.
u
u
5-34
REV.-A
o
o
r>
Check bridge rectifier
DB2.
Check the switching of
transistor Q26.
Check the bias of re-
sistors R51, R49, and
R50.
Check the voltage out-
put at out pin of SRI .
Check the coil of L2.
Replace DB2.
Replace Q26.
Replace defective re-
sistors.
Replace SR1
Replace L2.
5-35
REV.-A
Observe the waveform
at power ON from Ct
(pin 5), El (pin 9), and
Vref(pin14)oflC8B.
Observe the waveform
at power ON form the
collector of 01 6.
u
Replace DB1.
— I — I — r-*-! — I — r
5V/dlv 10>js/div
Fig. 5-8. CT Waveform
0— ^
1V/dlv 20;js/dlv
Fig. 5-9. El Waveform
Replace IC8B.
T 1 r**-« 1 r
Replace Q1 6.
10 V /div lOps/div
Fig. 5-10. Q1 6 Collector
Waveform
^
5-36
REV.-A
O
O
Observe the waveform
at power ON from the
base of 025.
Replace the
494 (IC8B).
V
10V/div 10>js/dlv
Fig. 5-1 1 . Q25 Base Voltage Waveform
Replace 025 and 027.
Replace D8 or L1 .
Replace R6.
NOTE: When output voltages
are not normal, check
R13,R14andR15.
n
5-37
REV.-A
Measure the voltage
level at 9 side of
diode ZD2.
Replace Q1 1 .
{>
^
Replace ZD2.
Replace defective re-
sistors.
^
^
\end/
^
5-38
o
REV.-A
c
PTS Signal Start
)
Observe the waveform
from pin 26 of the
7810CPU.
T
Connect the oscillos-
cope to 781 CPU pin
26, turn the power on,
and move the carriage
in both directions for
waveform measure-
ment.
0.5 ms /div 1V/dlv
Fig. 5-12. PTS Signal (at Pica Mode Printing)
,0
Does^
the signal
alternate between
HIGH and LOW
during carriage,
operation ?
N
1
Observe the waveform
from pin 6 of IC4C.
Replace the 4584
at IC4C.
Replace the PTS
sensor.
vENDy
r^
5-39
REV.-A
U
c
HOME Signal Start
3
Observe the waveform
form pin 21 of the
7810CPU.
^
Connect the oscillos-
cope to 781 OCPU pin
21 , turn the power on,
and move the carriage
in both directions for
waveform measure-
ment.
Doej
the signal
alternate between
HIGH and LOW
During carriage^
operation?
i
u
Observe the waveform
from pin 8 of IC4C.
Replace the 4584
at IC4C
Replace the HOME
sensor.
Vend/
Lj
5-40
r^
o
/^
REV.-A
5.4.2 Troubleshooting the Printer Mechanism
If a problem occurs, carefully check its symptoms, isolate its cause according to the troubleshooting in-
structions given in Table 5-5, and repair it. The troubleshooting information in Table 5-5 is given in the fol-
lowing five columns for easy and efficient analysis and remedy of the problem without errors.
(1) PROBLEM
Indentify problems.
(2) SYMPTOM
Check trouble against the symptoms given in this column if it can be identified.
(3) CAUSE
Check trouble against the causes specified in this column according to trouble sympton. Refer to the
repair levels specified for each cause.
(4) CHECKPOINT
Observe the instructions given in this column for checking trouble points.
(5) REPAIR METHOD
Make repairs according to the instructions given in this column. If the same problem or symptom per-
sists as before even after repairs, check other items in the column of causes and try again.
5-41
REV.-A
Table 5-5. Troubleshooting the Printer IVIechanism
Problem
Symptom
Cause
Checkpoint
Method
1. Carriage
motor
does not
rotate.
The carriage mo-
tor does not
operate at all at
power ON.
Foreign sub-
stances are
lodged in the
gears or me-
chanism.
Move the timing belt manual-
ly to check If the carriage
motor roatates.
•
Remove foreign sub-
stances.
The carriage
motor is defec-
tive.
Check the continuity of each
phase.
•
Replace the carriage mo-
tor.
2. Carriage
does not
move.
The carriage mo-
tor rotates in the
normal state, but
the carriage does
not move.
The belt trans-
mission pulley
and belt driven
pulley are de-
fective.
Check for broken or worn
gears.
•
•
Replace the belt transmis-
sion pulley.
Replace the belt driven
pulley.
The cartridge
ribbon is defec-
tive.
Remove the cartridge ribbon
to check if the carriage
moves.
•
Replace the cartridge rib-
bon.
The carriage is
defective.
Check for foreign substances
lodged in the carriage or for
broken or worn gears.
•
•
Remove foreign sub-
stances.
Replace the gear in the
carriage unit.
The carriage
operates abnor-
mally.
The HP sensor
is defective.
Check for foreign substances
lodged in the HP sensor.
•
Remove foreign sub-
stances.
Use an oscilloscope to check
the output waveforms.
•
Replace the HP sensor
set.
3. Printing
is not
execut-
ed.
The carriage
moves, but print-
ing is not exe-
cuted.
The common
wires of the
head cable are
cracked or dis-
connected.
Check the continuity of the
common wires of the head
cable.
•
Replace the head cable
set.
The head cable
connectors are
not connected.
Verify that the printhead is
mounted in the right posi-
tion.
•
Reinsert the printhead
unit.
Check the connector contin-
uity.
•
Replace the head cable
set.
The common
wires of the
printer cable
are cracked or
disconnected.
Check the continuity of the
common wires of the printer
cable.
•
Replace the printer circuit
board set.
The paper end is
not printed.
The paper guide
auxiliary plate is
not in the right
position.
Verify that the paper guide
auxiliary plate is mounted in
the right position.
•
Reinsert the paper guide
auxiliary plate.
u
u
■^
5-42
REV.-A
Table 5-5. Troubleshooting the Printer Mechanism (cont'd)
O
'^
r^
Problem
Symptom
Cause
Checkpoint
Method
4. Dot is
not im-
printed.
A specific dot is
no imprinted.
The printhead is
defective.
Verify that the dot wire is not
broken or missing.
• Replace the printhead
unit
Check the resistances of the
head coil.
• Replace the printhead
unit
The dot is not
printed some-
times.
The cable head
is not connect-
ed correctly.
Verify that the head cable is
firmly inserted into the con-
nector.
• Insert the head cable firm-
ly.
Check for dirt around the
head cable connector.
• Clean and reconnect
The printhead is
defective.
Verify that the tip of the dot
wire is not worn.
• Replace the printhead
unit
Check the resistances of the
head coil.
• Replace the printhead
unit
5. Printing
color is
light
and the
printing
density
is not
uniform.
The overall print-
ing color is light
the overall print-
ing density is not
uniform.
The printhead is
defective.
Verify that the tip of the dot
wire is not worn.
• Replace the printhead
unit
Check the resistances of the
head coil.
• Replace the printhead
unit
The platen gap
is not properly
adjusted.
Check the gap between the
tip of the dot wire and the
platen.
• Readjust the platen gap.
6. Paper is
not fed.
Printing is exe-
cuted, but the
paper is not fed,
or the paper feed
pitch is not nor-
mal.
The release
lever does not
operate correct-
ly.
Verify that the release lever
is in the right position.
• Place it in the right posi-
tion.
Foreign sub-
stances are
caught in the
paper path.
Verify that no foreign sub-
stances are lodged in the
paper guide path.
• Remove any foreign sub-
stances.
The paper feed
motor does not
drive the gear
correctly.
Verify that no foreign sub-
stances are lodged between
the gears (paper feed trans-
mission gear, etc), and that
the gears are not broken or
worn.
• Remove the foreign sub-
stances.
• Replace the paper feed
transmission gear.
• Replace the platen gear.
• Replace the sprocket gear.
• Replace the sprocket
transmission gear.
The sprocket
unit is defec-
tive.
Verify that the sprocket
wheel is positioned correctly.
• Readjust the sprocket
wheel.
7. Ribbon
is not
fed.
The ribbon is not
fed.
The cartridge
ribbon is defec-
tive.
Verify that ribbon is fed
when the cartridge ribbon is
rotated manually by the
knob.
• Replace the cartridge rib-
bon.
The cartridge is
defective.
Verify that the ribbon drive
gear rotates when the car-
riage moves.
• Replace the gears in the
cartridge unit
5-43
REV.-A
Table 5-5. Troubleshooting the Printer Mechanism (cont'd)
Problem
Symptom
Cause
Checkpoint
Method
The ribbon is fed
only when the
carriage moves
to the right (or to
the left).
The ribbon
planetary lever
is defective.
Verify that the ribbon driven
gear rotates when the car-
riage moves.
• Replace the ribbon plane-
tary lever set.
8. Paper
be-
comes
stained.
The paper be-
comes ink
stained where
printing is not
executed.
The ribbon
mask is not in
the right posi-
tion.
Verify that the ribbon mask
is in the right position.
• Readjust the ribbon mask.
The platen gap
is not properly
adjusted.
Check the gap between the
tip of the dot wire and the
platen.
• Readjust the platen gap.
9. Printing
is exe-
cuted
without
paper
setting.
Printing is exe-
cuted without
paper setting.
The PE sensor
is defective.
Use a tester to verify the mi-
croswitch turns ON/OFF
when the paper is inserted/
drawn out.
• Replace the PE sensor
unit.
Verify that the PE sensor
lever moves smoothly.
• Replace the PE sensor
unit.
u
^
^
5-44
REV.-A
o
CHAPTER 6
MAINTENANCE
6.1 PREVENTIVE MAINTENANCE 6-1
6.2 LUBRICATION AND ADHESIVE APPLICATION 6-1
LIST OF FIGURES
Fig. 6-1 Correct Adhensive Application 6-2
Fig. 6-2 Lubrication and Adhesive Application Diagram 1 6-3
Fig. 6-3 Lubriccation and Adhesive Application Diagram 2 6-4
^ LIST OF TABLES
Table 6-1 Lubrication Schedule 6-1
Table 6-2 Adhesive Application Points 6-1
o
6-i
REV.-A
O
6.1 PREVENTIVE MAINTENANCE
Proper maintenance is essential to maintain optimal printer performance for the longest possible period
and to minimize malfunction frequency. Preventive maintenance includes regular cleaning of the case ex-
terior, using alcohol, and occasional vacuuming of the mechanism interior to remove dust and paper parti-
cles. Following cleaning, refer to Section 6.2 to verify that the unit is adequately lubricated. Before return-
ing the serviced printer to the consumer, inspect the springs and paper feed rollers and the basic operation
of the unit.
WARNING
Disconnect the printer from the power supply before performing maintenance. Do not use
thinner, trichloroethylene, or ketone-based solvents on the plastic components of the
printer.
r^
6.2 LUBRICATION AND ADHESIVE APPLICATION
We recommend that the points illustrated in Figure 6-1 be lubricated, according to the schedule listed
in Table 6-1, with G-14, which has been extensively tested and found to comply with the needs of
the Commodore MPS-1000 printer. Lubricate the printer when it is disassembled for part
replacement, or every 6 months or 3,000,000 lines of print, whichever comes first. Be sure that the parts
to be lubricated are clean before applying lubricant, and avoid excessive application, which may dam-
age related parts.
Adhesive application is necessary at the points listed in Table 6-2 when the unit is disassembled, or as
needed following routine maintenance. We recommend Neji-lock green #2 adhesive to be applied to
the points diagrammed in Figure 6-1 ; apply adhesive to one-third the edge of screws and at the edges of
sensor boards, and avoid overflow of excess to related parts.
n
Table 6-1 . Lubrication Schedule
Ref
1
2
3
4
Lubrication Point
Teeth of the carriage guide plate
Carriage assembly
Shaft of platen transmission gear
Carriage guide shaft
G-1 4 is available in 40 cc containers.
Part No.: 601 162-43 (Vendor P/N: B701 400001)
Table 6-2. Adhesive Application Points
Ref
7
8
Application Point
Belt tension plate securing screw
PTS sensor securing screw
Two ribbon mask securing screws
Point where timing belt is connected beneath the carriage
Neji-lock green #2 is a commercially available adhesive.
Part No.: 601 162-44 (Vendor P/N: B730200100)
6-1
REV.-A
fe-
U
<Toscrews>
Carriage set Timing belt
Fig. 6-1 . Correct Adhesive Application
^
^
6-2
r^
REV.-A
n)
c
S
o
c
o
c
o
(Q
O
a
a
<
>
'35
0)
c
(0
O
3
CM
I
6-3
REV.-A
LJ
c
i
(0
O
o
c
o
(D
O
"5.
Ql
<
>
1
c
(0
c
o
(0
o
3
CO
I
6
^
^
6-4
REV.-A
^
CHAPTER 7
REFERENCE MATERIALS AND SCHEMATICS
7.1 IC DESCRIPTIONS 7-1
7.1.1 7810/7811 Microprocessor 7-2
7.1 .2 494 Regulator IC 7-7
7.1 .3 SLA5040 COM 7-9
7.1 .4 61 1 6 Static RAM 7-1 1
7.1 .5 Miscellaneous TTL and CMOS Devices 7-1 2
7.2 EXPLODED DIAGRAMS, SCHEMATICS
AND PARTS LIST 7-14
LIST OF FIGURES
r^
g. 7-1 781 0/781 1 Pin Diagram 7-2
g. 7-2 781 0/781 1 Block Diagram 7-5
g. 7-3 OP Code Fetch Timing 7-6
ig. 7-4 Memory Read Timing 7-6
ig. 7-5 Memory Write Timing 7-6
g. 7-6 494 Pin and Block Diagrams 7-7
g. 7-7 494 Dead Time and Feedback Control 7-8
g. 7-8 SLA5040 COM Pin Diagram 7-9
g. 7-9 6116 Pin and Block Diagrams 7-1 1
g. 7-10 05 Hex Inverter with OC Diagram 7-12
g. 7-1 1 07 Hex Buffer with OC Diagram 7-1 2
g. 7-12 75 Quad Latch Diagram 7-12
g. 7-13 32 Quad 2-lnput OR Diagram 7-13
g. 7-14 4584 Hex Schmitt Trigger 7-13
ig. 7-1 5 CATX Circuit Diagram 7-1 9
ig. 7-1 6 CATX Component Layout 7-20
r^.
7-i
REV.-A
Fig. 7-1 7 COMI Circuit Diagram 7-21
Fig. 7-1 8 COMI Component Layout 7-22
Fig. 7-19 Exploded Diagram 1 7-23
Fig. 7-20 Exploded Diagram 2 7-24
Fig. 7-21 Exploded Diagram 3 7-25
LIST OF TABLES
Table 7-1 CATX Board LSIs 7-1
Table 7-2 CATX Board Transistors 7-1
Table 7-3 COMI Board LSI 7-1
Table 7-4 7810/781 1 Port Functions 7-3
Table 7-5 781 1 Port F Operation 7-4
Table 7-6 7810 Port F Operation 7-4
Table 7-7 7810 Mode Setting 7-4
Table 7-8 494 IC Port Functions 7-7
Table 7-9 SLA5040 COM Port Functions 7-9
Table 7-1 SLA5040 COM Address Assignment 7-1
Table 7-1 1 6116 Static RAM Port Functions 7-1 1
Table 7-12 Parts list 7-14
u
^
u
7-ii
r^
O
REV.-A
7.1 IC DESCRIPTIONS
This section describes the primary ICs on the CATX board (Table 7-1) and supplements the data provided
in Chapter 2. Tables 7-2 and 7-3 list associated transistors.
Table 7-1 . CATX Board LSIs
Name of IC
Part Number
Type
Location
^PD7810G
X400078100
CPU
5A
E05020AA
Y560800001
SLA5040 COM
1A
^PC494C
X440064940
Switching regulator
8B
//PC78L05A
X440078052
Regulator
SRI
7505
X420 100050
Hex Inverter
2C
7407
X4201 00070
Hex Buffer/Driver
7A
74LS32
X420300320
Quad2-lnputOR
3C
74LS75
X420300750
4 Bit Bistable Latch
6B
TC4584BP
X460458400
Hex Schmitt Trigger
4C
HM6116LP
X400161164
S-RAM
2A
Table 7-2. CATX Board Transistors
Name of Transistor
Part Number
Type
Location
2SA1015
X300101509
PNP50V0.4W
Q11
2SA1020
X300 102009
PNP50V2A0.9W
027,14,15
2SC1815
X302181509
NPN60V0.4W
010, 12J3J6
2SA1307
X300 130700
50V 5A 20W
026
2SC3293
X302329300
01 ~ 9, 28
2SC3299
X302329900
50V 5A 20W
025
2SD1630
X303 163000
CIM ^ 24
Table 7-3. COM 1 Board LSI
Name of IC
Part Number
Type
Location
27256
-
ROM
1A
r^,
7-1
REV.-A
7.1.1 7810/7811 Microprocessor
Figures 7-1 and 7-2 describe the 7810/781 1 microprocessor, and Tables 7-4 through 7-7 describe its
function^.
Kj
PA7-0
Port A
PB7-0
PortB
PC7-0
Porta
PD7-0
PortD
PF7-0
PortF
NMI
Non-maskable Interrupt
INTI
Interrupt Request
MODE 0.1
Mode 0.1
X1,X2
Crystal
AN7-0
Analog Input
RD
Read Strobe
WR
Write Strobe
ALE
Address Latch Enable
RESET
Reset
VAref
Reference Voltage
RAO
1 \^
64
Vcc
PAl
2
63
V DD
PA2
3
62
—
PD7
PA3
o
4
61
PD6
PA4
5
60
PD5
PA5
o
6
59
PD4
PA6
7
58
PD3
PA7
8
57
PD2
PBO
o
9
56
PDl
FBI
PB2
10
11
55
54
PDO
PF7
PB3
12
53
PF6
PB4
13
52
PF5
PB5
14
51
PF4
PBS
1^ 7810/
1^7811
50
PF3
PB7
49
PF2
PCO
48
PFl
PCI
o
18
47
PFO
PC2
19
46
ALE
PC3
20
45
WR
PC4
21
44
RD
PC5
22
43
A Vcc
PC6
23
42
Varef
PC7
24
41
AN7
NMI
25
40
— —
AN6
INTI
26
39
AN5
MODEl
27
38
AN4
RESET
28
37
AN3
MODEO
29
36
AN2
X2
o
30
35
ANl
XI
31
34
ANO
V CO
32
33
AVss
u
Fig. 7-1. 7810/7811 Pin Diagram
• 256 bytes built-in RAM (addresses OFFOOH-OFFFFH)
• 4096 bytes mask-ROM (781 1 only, addresses 0-OFFH)
• Direct addressing of up to 64K bytes
• 8-bit A/D converter
• 1 58 instructions
• 1 jjs instruction cycle
• 1 6-bit event counter
• Two 8-bit timer counters
• 3 external and 8 internal interrupts; 6 levels priority and 6 interrupt addresses
• General purpose serial interface (asynchronous, synchronous, and I/O modes)
• I/O line (7811: 40-bit I/O port; 7810:24 bits edge detection, 4 inputs)
• Zero cross detection
• Standby function
• Built-in clock pulse circuit
• NMOS
^
7-2
REV.-A
Table 7-4. 7810/7811 Port Functions
O
,^
Pin
Signal
Direction
Description
1 ~8
PA0~7
I/O
Port A. Eight-bit I/O with output latch. I/O possible by mode A (MA) register.
Output high.
9-16
PBO - 7
I/O
Port B. Eight-bit I/O with output latch. I/O possible by mode B register (MB).
Output high.
17 ~
24
PC0~7
I/O
Port C. Eight-bit I/O with output latch. Port/control mode can be set by mode
control C (MCC) register. Output high.
25
NMI
IN
Non-maskable interrupt of the edge trigger (trailing edge).
26
INTI
IN
Maskable interrupt input of the edge trigger (leading edge). Also used as the
AC input zero cross detecting terminal.
27,29
MODE 1,0
I/O
7811: = low and 1 =high
781 modes set in accordance with external memory (see Table 7-5).
28
IN
Low reset
RESET
30,31
X2,X1
-
Crystal connection for built-in clock pulse. When clock pulse is supplied exter-
nally, input must be to XI .
32
Vss
-
Supply voltage, Vss, OV
33
AVss
-
Analog Vss
34-
41
AN0~7
IN
Eight analog inputs of A/D converter. AN7 ~ 4 can be used as the input ter-
minals to detect the leading edge and to set the test flag upon detection of the
trailing edge
42
Varef
IN
Reference voltage
43
AVcc
-
Analog Vcc
44
RD
OUT
Read strobe. Low at the read machine cycle and at reset, high at other times.
45
WR
OUT
Write strobe. Low during the write machine cycle and at reset, high at other
times.
46
ALE
OUT
Address latch enable. Latches the lower 8 address bits to access external
memory.
47 -
54
PF0~7
PortF
781 1 : Port bit-by bit I/O possible by mode F register. In extension mode,
gradual address output assignment is possible in accordance with the size of
external memory. See Table 7-6.
781 0: By setting modes and 1 , assignment to the address bus (AB1 5-8)
can be made in accordance with the size of the external memory. The remain-
ing terminals can be used as I/O ports. See Table 7-7.
55 -
62
PD0~7
Port D.
7811: Port bit-by-bit I/O possible.
In extension mode, PD7-0 act as the multiplexed address/data bus (AD7-0).
781 0: Multiplexed address/data bus to access external memory.
63
Vdd
-
Supply voltage, Vdd, +5V
64
Vcc
-
Supply voltage, Vcc, +5V
r-)
7-3
REV.-A
Table 7-5. 781 Mode Setting
Model
ModeO
External memory
4KB Addresses to OFFF
1 (Note)
1 6KB Addresses to 3FFF
1 (Note)
1 (Note)
64KB Addresses to FEFF
LJ
Table 7-6. 781 1 Port F Operation
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PFO
External Memory
Port
Port
Port
Port
Port
Port
Port
Port
256 bytes (max.)
Port
Port
Port
Port
AB11
AB10
AB9
ABB
4K bytes (max.)
Port
Port
AB13
AB12
AB11
AB10
AB9
ABB
16K bytes (max.)
AB15
ABU
AB13
AB12
AB11
AB10
AB9
ABB
60K bytes (max.)
Table 7-7. 7810 Port F Operation
M0DE1
MODEO
PF7
PF6
PF5
PF4
PF3
PF2
PF1
PFO
External Memory
Port
Port
Port
Port
AB11
AB10
AB9
ABB
4K bytes
1
Port
Port
AB13
AB12
AB11
AB10
AB9
ABB
1 6K bytes
1
1
AB15
ABU
AB13
AB12
AB11
AB10
AB9
ABB
64K bytes
u
NOTE: Pull-up is made.
^
7-4
REV.-A
O
d iUOd
__iz_
iWOd
O
I
AZ.
idOd
o
I
CD
V
9 itiOd
1.
V idOd
^^^ri^
-^
to
>
o
cr
UJ
cr
4/)
UJ
o
o
►-
z
<j
U)
•— •
UJ
z
Q
** 1
> -I
(Q O
o cc
Z I-
< 2
>- o
UJ
UJ
cr
uiriAi
o
in
o
^
> <
)
o
^\
<
QC
UJ
^
O <
>
o
o
u
^
i^ JAz
cr
UJ
1^
o cr
\ UJ
o
a
JT
X X
r^
O 0|^
K K O
»- cr l«/)
\ W
O 1^ CV4
o o u
a Q. 0.
6 6
vrm
»- CL
\
O
Q.
^ O *-
O O O
U U
\\\
in to r*
u o o
CL CL Q.
_l 6 6 6
I -
z
<
Fig. 7-2. 7810/781 1 Block Diagram
7-5
REV.-A
CPU Timing (Figs. 7-3 through 7-5)
Three oscillations define one state. The OP code fetch requires four states: during T1 to T3, program me-
mory is read; instructions are interpreted during T4. AB1 5-8 are output from T1 to T4. AD7 ~ (PD7 -
0) are used in the multiplex mode; the address is latched during T1 at the ALE signal. Since the memory
addressed is enabled after disengaging the driver (AD7 - 0), RD is output from T1 -T3, fetched at T3, and
processed internally at T4.
ALE and RD signals are executed from T1 -T3; the OP code fetch for these two signals is performed at T4.
WR is output from the middle of T1 to the beginning of T3. The address and ALE timing is the same as
that for memory read; however, following address output AD7 - {PD7 - 0) are not disabled, and write
data are output at AD7 - at the beginning of T1 and the end of T3.
NOTE: When PD7 - are set to the multiplexed address {AD7 - 0)/data bus and PF7 - to the address
bus (AB7 - 0), the RD and WR signals in the machine cycle are high when memory is not being ac-
cessed.
Tl T2 T3 T4
CLOCK
u
ALE
AB15-8
CPF7-03
X
ADDRESS
XII
AD7-0
(PD7-03
RD
CLOCK
ALE
AB15-8
(PF7-0)
" ^ ADDRESS ) Q
OP CODE
y-
Fig. 7-3. OP Code Fetch Timing
Tl
T2
-T
\
X
ADDRESS
^
T3
XI
AD7-0
(PD7-0)
RD
CLOCK
ALE
AB15-8
CPF7-0D
AD7-0
CPD7-0)
RD
' \ ADDRESS^ ( READ DATA ) ^
\
Fig. 7-4. Memory Read Timing
Tl T2
/
w
X
ADDRESS
" \ ADDRESS X "
WRITE DATA
\
Fig. 7-5. Memory Write Timing
7-6
DC
DC
^
REV.-A
O
7.1.2 494 Regulator IC
The 494 regulator IC is described in Figures 7-6 and 7-7 and Table 7-8.
(TLA9S0NLY)
rST~EEirN(r"j output
DEAD O.'V
TIME
CONTROL
NONINVERTING
INPUT
INVERTING
INPUT
NONINVERTING
INPUT
INVERTING
INPUT
FEEDBACK
(TL495 ONLY)
NON
INV INV REF OUTPUT
INPUT INPUT OUT CONTROL Vcc
NON INV FEED DEAD
INV INPUT BACK TIME
INPUT CONTROL
Fig. 7-6. 494 IC Pin and Block Diagrams
Table 7-8. 494 IC Port Functions
.^
o
Pin
Signal
Description
1
NON INV
Non. Inv. Input of error amplifier for output voltage detection.
2
INV
Inv. Input of error amplifier for output voltage detection.
3
FEEDBACK
Feedback for phase correction.
4
CONTROL
Controls transistor OFF time.
5
CT
Capacitor for oscillation frequency adjustment.
6
RT
Resistor for oscillation frequency adjustment.
7
GND
Ground
8
CI
Transistor collector for pulse amplification.
9
El
Transistor emitter for pulse amplification.
10
E2
Transistor emitter for pulse amplification.
11
C2
Transistor collector for pulse amplification.
12
Vcc
Power
13
OUTPUT CONTROL
Selection of parallel or push-pull.
14
REF OUT
+5V reference voltage
15
INV
Inv. Input of error amplifier for output current detection.
16
NON INV
Non. Inv. of error amplifier for output current detection.
7-7
REV.-A
Vcc = 15V
Q
TEST f
IN PUTS]
12 KO
ff V
—II-
0.01>jF|
£
Vcc
DEAD TIME CI
El
FEEDBACK
RT C2
CT E2
{+)] STEERING
(_) CONTROL
|_^j -ERROR
OUTPUT
CONTROL
Vz
REF
OUT
GND
"T
1500^
2W >
i6on
2W
i-OOUTPUTl
-O0UTPUT2
-O(0PE
-O(0PE
N)|0NL
495
Y
^
VOLTAGE
AT CI
VOLTAGE
ATC2
VOLTAGE
ATCT
Vcc
_^ Vcr
Lnnruinm:
AA/wi/wi/wwwwm
DEAD-TIME THRESHOLD VOLTAGEj;;;^.
CONTROL
INPUT
OV
DUTY
CYCLE MAX
t*-OV« —
VOLTAGE WAVEFORMS
Fig. 7-7. 494 Dead Time and Feedback Control
u
^
7-8
^
REV.-A
7.1.3 SLA5040COM
Figure 7-8 diagrams the pin assignment of the SLA 5040 COIVI gate array. Tables 7-9 and 7-10 describe
its functions.
H D 1 1 1
A2|
VDD(-l-5V)
HD2 d
All
H D 5
HD 3 [T
AOl
HD 6
H04 1 A
39|
H D 7
A LE [T
38|
HD 8
WR Q
37|
HD9
R D L 7
36|
AB15
PWD LI
SLA50A0
3 5|
BUSY
AB7 Q
COM
3A|
STRB
AB6 Ho
33|
I N 7
AB 5 [TT
32|
I N 6
ABA QT
31|
I N 5
A B3 QT
30|
I N 4
A 82 QZ
29|
I N 3
AB 1 fTT
m
I N 2
ABO Il6
27|
I N 1
D B7 [TT
2 6|
I N
DBO H?
25|
DB6
D Bi m
2Aj
DBS
DB2 [20
m
DBA
V SS 121
m
DB3
Fig. 7-8. SLA5040 COM Pin Diagram
Table 7-9. SLA5040 COM Port Functions
r^
r^
Pin
Signal
Direction
Description
1 ~ 4 and
37 ~ 41
HD1 ~ 9
Out
Head data written to 02H and 03H and output by
PWD..
5
ALE
In
Address latch enable. When high, DBO - 7 are output
to ABO - 7. When ALE is low, the data are latched.
6
WR
In
Strobe for writing head data, and timing parameter of
the STROBE signal.
7
RD
In
Strobe for reading input data.
8
PWD
In
Power down signal. HD1 -9 are output when PWD
low. When PWD is high, HD1 - 9 are low.
9-16
ABO- 7
Out
Lower addresses latched by ALE.
1 7 ~ 20 and
22 ~ 25
DBO -7
In
Address/data bus. Tri-state I/O; multiplexed address/
data bus.
21
Vss
—
Ground
26-33
IN0~7
In
Data is latched-in by STROBE signal and can be read by
OOH. And Data can be read directly at 04H.
34
STRB
In
Strobe pulse to latch-in data.
35
BUSY
Out
Output high when STROBE is input.
36
AB15
In
Address bus 1 5. Chip select.
42
VDD
In
+5V
7-9
REV.-A
• Functions of SLA5040 COM
1 . The 781 outputs both address (ABO -^ AB7) and data (DBO ^ DB7) to port PDO ~ PD7. The gate array
uses the ALE signal to separate the signals; when ALE is high the addresses (ABO - AB7) from ports
PDO - PD7 are output to terminals ABO ^^ AB7 of the SLA5040 COM and are latched by the trailing
edge of the ALE signal.
2. The data (INO - IN7) is latched by the positive edge of the STROBE signal and SLA5040 COM automati-
cally outputs the BUSY signal.
3. The SLA5040 COM has the six functions described in Table 7-1 0.
Kj
Table. 7-10. SLA5040 COM Address Assignment
Address
R/W
Pin name
Function
OGH
R
DBO ~ DB7
The data which is latched by STROB pulse can be read at OOH by clearing
the BUSY signal.
01H
R
DBO
Input of the STROB signal is recognized by reading 01 H.
1 : Recognized
0: Not recognized
02H
W
DBO ~ DB7
HD8 ^ HD1
HD1 - 8 are latched by writing to 02H, and are output when PWD is
low.
03H
W
DB7
H9
HD9 is latched by writing to 03H, and is output when PWD is low.
04H
R
INO ~ IN7
DBO ^ DB7
The input data (INO ~ IN7) can be read directly at 04H with an un-
changed BUSY signal.
05H
W
DBO
The output timing of the BUSY signal:
0: Positive edge of STRB signal
1 : Negative edge of STRB signal
u
NOTE: OOH ~ 05H are the values at which address bits AO ~ 7 are decoded in the gate array. AB1 5 is in-
put by decoding A8 ~ 1 5, thus enabling address mapping.
Correspondence between the data (DO ~ 7) and the head data (HDO ~ 9) is as follows:
D7 - HD1 D7 -* HD9
D6 ^ HD2
/ /
DO ^ HD8
Address 02 H Address 03 H
^
7-10.
REV.-A
-^
7.1.4 61 16 Static RAM
The external pin assignment and internal circuitry of the 61 16 SRAM are illustrated in Figure 7-9. Table
7-11 describes port functions of the IC.
-IX=| |_| o""
" Ognd
i/OiO
l/OeO-
r^
Fig. 7-9. 6116 Pin and Block Diagrams
• High-speed access: HM6116/P-2 120 ns
HM61 1 6/P-3 1 50 ns
HM61 1 6/P-4 200 ns
• +5V power
• Low electric consumption: Operation 1 80 mw (typ)
Standby lOOmw(typ)
• Complete static memory (clock timing and strobe not required)
• All TTL compatible I/O
• Access and cycle times equal
• Standard 1 6K EPROM/MROM compatible pin arrangement
Table 7-11. 6116 Static RAM Port Functions
o
Pin
Signal
Direction
Description
1 ~8
A7 ~ AO
In
Address input
9 ~ 1 1 and
13- 17
l/Oi ~ l/Os
In/Out
Data Input/Data Output
12
GND
-
Ground
18
CS
In
Chip select
19
A10
In
Address input
20
OE
In
Output enable
21
WE
In
Write enable
22,23
AS, AS
In
Address input
24
Vcc
In
+5V power supply
7-11
REV.-A
7.1 .5 Miscellaneous TTL and CMOS Devices
Figures 7-1 througii 7-1 4 illustrate the internal circuitry of the primary TTL and CMOS devices used in the
printer.
Vcc A6 Y6 AS Y5 A4 Y4
F2] [TTi [^ m f?
U
13
Lpw-I L-Oo-I 4>o-l
rt>^ rt>^ rl^^
111 UJ liJ iiJ [5j LiJ ill
A1 Y1 A2 Y2 A3 Y3 GND
W
Fig. 7-1 0. 05 Hex Inverter with OC
Vcc A6 Y6 A5 Y5 AA Y4
[13] [12] [n] [Tol m IT
u
tir
TI]
Al Yl A2 Y2 A3 Y3 GND
Fig. 7-1 1 . 07 Hex Buffer with OC
W
_ENABLE _
IQ 2Q 2Q 1-2 GND 3Q 3Q AQ
[i6][T5][TZ][i3][T 2][TT][^r9l
Q D
G
Q
D Q
G
Q
r:
Q D
G
Q
U LiJ liJ
D Q
G
Q
8
IQ ID 2DENABLEVCC 3D AD AQ
3-A
Fig. 7-1 2. 75 Quad Latch
7-12
FUNCTION TABLE
(Each Latch)
In puts
Out puts
D G
Q Q
L H
L H
H H
H L
X L
Qo Qo
^
REV.-A
^
O
n
Vcc BA
ui 13
AA
12
TTl
B3
IC
1
a;
9
1 Y3
8
4
;>
J
r
-^
1
— /
-^
1
J L
2_
3
^
J
_5
J
_6
J L
1}
Al 81 Y A2 82 Y2 GND
Fig. 7-13. Quad 2-lnput OR
VDD
fiZl fill 12] 11 10 T" [i]
*-^po^ L^^oJ L|^>o-l
pu>c>-| r^>°i r^^
1 U lU ^ U U 11
vss
Fig. 7-14. 4584 Hex Schmitt Trigger
7-13
REV. -A
7.2 EXPLODED DIAGRAMS. SCHEMATICS AND PARTS LIST
Figures 7-1 5 through 7-1 7 are exploded (assembly) and schematic diagrams provided to supplement the text.
Table 7-12 lists the parts number and the item description.
u
Table 7-12. Parts List
Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore. Industry stan-
dard parts (Resistors, Capacitors, Connectors) should be secured locally. Approved cross-references for TTL chips, Transistors, etc.
are available in manual form through the Service Department, order part #314000-01. Unique or non-standard parts will be stocked
by Commodore and are indicated on the parts list by a "C". Vendor Name and part number have been provided for your convenience
in ordering custom or unique parts.
Ref. No.
Part No.
Item Description
601160-OOA
MPS-1000 PRINTER (UL)
601160-OOB
MPS-1000 PRINTER (CSA)
6011 60-000
MPS-1000 PRINTER (VDE)
601160-OOD
MPS-1000 PRINTER (BSD
601160-OOG
MPS-1000 PRINTER (AUST)
601160-OOH
MPS-1000 PRINTER (DOMESTIC)
100
601160-01
LOWER CASE C (553-1010)
101
601160-02
UPPER CASE ASS'Y EC
102
601160-03
C.T.B. SCREW (M4x 12)
103
601160-04
PRINTER COVER C (553-1040)
104
601160-05
SEPARATOR (553-006)
105
601160-06
FRONT CAP C (553-1050)
107
601160-07
BOTTOM CAP C (553-1060)
108
601160-08
BASE PLATE ASS'Y EA (553-S101)
109
601160-09
C.T.P.B.F. SCREW (M3 x 10)
110
601160-10
C.P.(P). SCREW (M3x 10)
111
601160-11
C.P.O SCREW (M3 X 5)
112
601160-12
LOGO PLATE C
113
601160-13
RUBBER STAND (553-016)
114
601160-14
KNOB (553-1 100)
201
601160-15
PULSE MOTOR AD
202
601160-16
C.T.P.B.(P). (M3 X 8)
203
601160-17
SIDE FRAME R
204
601160-18
PF TRANSMISSION GEAR
205
6011 §0-1 9
LEAF SPRING (5 x 0.15 x 10)
206
601160-20
C.P.(P). SCREW (M3 X 10)
207
601160-21
SIDE FRAME L
208
601160-22
RELEASE LEVER C
209
601160-23
PAPER HOLDING LEVER SPRING
210
601160-24
PF MOTOR SITTING PLATE
211
601160-25
C.P.(P.) SCREW (M3 X 5)
212
601160-26
MOTOR UNIT EA
217
601160-28
BELT TENSION PLATE ASS'Y EA
218
601160-29
CUP SCREW (M3 X 4)
224
601160-30
TIMING BELT
225
601160-31
BELT DRIVING PULLEY ASS'Y EA
226
601160-32
PLAIN WASHER (4 x 0.2 x 7.75)
227
601160-33
RETAINING RING TYPE-E (3)
231
601160-34
PE SENSOR UNIT EA
232
601160-35
HP SENSOR ASS'Y EA
233
601160-36
C.T.P.B. SCREW (M3 x 8)
234
601160-37
TERMINAL BOARD ASS'Y EA
240
601160-39
CARRIAGE UNIT EA
241
601160-40
HEAD CABLE ASS'Y EA
u
KJ
7-14
REV.-A
Table 7-12. Parts List (Cont'd)
^
<^
r^.
Ref. No.
Part No.
Item Description
242
601160-41
HEAD SITTING PLATE L
243
601160-42
HEAD SITTING PLATE R
244
601160-43
C.P.(P). SCREW (M3 X 8)
245
601160-44
C.P.(P). SCREW {M3 X 6)
260
601160-45
CARRIAGE GUIDE SHAFT
261
601160-46
C, GUIDE SHAFT SITTING PLATE
263
601160-48
CARRIAGE GUIDE PLATE
264
601160-49
LEAD WIRE
265
601160-50
C.P. (P). SCREW (M3 X 8)
266
601160-51
C.B. SCREW (M3 x 3)
268
601160-53
RIBBON MASK
270
601160-55
PLATEN UNIT EA
280
601160-56
PAPER FEED ROLLER SPRING GUIDE
281
601160-57
PAPER FEED ROLLER SPRING
282
601160-58
PAPER FEED ROLLER
283
601160-59
PAPER FEED ROLLER SHAFT
284
601160-60
PAPER HOLDING ROLLER ASS'Y EA
285
601160-61
PAPER GUIDE PLATE ASS'Y EA
300
601160-62
CATX CIRCUIT BOARD UNIT
1A
601160-64
LSI (E05020AA)
5A
601160-65
LSI (MPU78010BD)
2C
601160-66
TTL-IC (HEX INVERTER)
3C
601160-67
TTL-IC (QUAD 2-INPUT OR)
6B
601160-68
TTL-IC (4BIT BISTABLE LATCH)
7A
• 601160-69
TTL-IC (HEX INV. BUFFER/DRIVER)
4C
601160-70
C-MOS IC (HEX SCHMITT TRIGGER)
8B
601160-71
LINEAR IC (TL 494)
SRI
601160-72
IC (5VDC REGULATOR)
2A
601160-73
RAM (2KX8BIT)
Q1-9,28
601160-74
TR. (50V 2A 20W)
Q10,12,13
601160-75
TR. (40V 100MA0.3W)
Q14,15
601160-76
TR. (PNP 60V 0.9W)
Q11
601160-77
TR. (40V 100MA 0.3W)
Q17-24
601160-78
TR. (60V 2A 10W)
Q25
601160-79
TR. (60V 5A 20W)
Q26
601160-80
TR. (60V 5A 20W)
Q27
601160-81
TRANSISTOR (50V 0.9W)
Q16
601160-82
TRANSISTOR (60V 100MA 0.4W)
ZD1
601160-83
ZENER DIODE (4.95-5.05V)
ZD2
601160-84
ZENER DIODE (3.51 -3.69V 250MA)
ZD3
601160-85
ZENER DIODE (17.55-1 8.4V 250MA)
D1,3
601160-86
DIODE (35V 100MA)
D2,4,5
601160-87
DIODE (SI 100V 1A)
D6
601160-88
DIODE (40V 1A)
D7
601160-89
DIODE (SI 200V 0.5A)
D8
601160-90
DIODE (90V 1A)
DB1
601160-91
RECTIFIER STACK (100V 3A)
DB2
601160-92
RECTIFIER STACK (100V 1.5A)
CR1
601160-93
CERAMIC OSCILLATOR (11 MHZ)
CI
601160-94
AL. ELECT. CAP. (6800/*F DC50V)
C2
601160-95
AL. ELECT. CAP. (6800/tF DC25V)
C3
601160-96
AL. ELECT. CAP. (2200/tF DC35V)
C4
601160-97
AL. ELECT. CAP. (470^F DC 10V)
C5
601160-98
AL. ELECT. CAP. (1.0/tF DC50V)
7-15
REV.-A
Table 7-12. Parts List (Cont'd)
Ref. No.
Part No.
item Description
C6
601160-99
AL. ELECT. CAP. {22/tF DC35V)
C7,14,16
601161-00
CERA. CAP. (470pF DC50V)
C8
601161-01
CERA. CAP. (1500pF DC50V)
C9,10
601161-02
CERA. CAP. (390/tF DC50V)
C11,12
601161-03
CERA. CAP. (33pF DC50V)
C13,15,18,
601161-04
CERA. CAP. (0.VFDC25V)
19,25-35
C20
601161-05
CERA. CAP. (0.01 /tF DC50V)
C21
601161-06
CERA. CAP. (O.OVF DC25V)
C17
601161-07
FILM CAP. (O.OVF DC50V)
RM1
601161-08
RES. ARRAY (3.3kQ 1/8W-9)
RM2
601161-09
RES. ARRAY (3.3kQ 1/8W-10)
RMS
601161-10
RES. ARRAY (3.3kn 1/8W-7)
RM4
601161-11
RES. ARRAY (2.2kQ 1/8W-8)
RM5
601161-12
RES. ARRAY (lOkfl 1/8-11)
RM6
601161-13
RES. ARRAY (3.3ki2 1/8-4)
R1
601161-14
CEMENT RES. (1812 5W)
R5
601161-15
CEMENT RES. (0.68Q 3W)
R6
601161-16
CEMENT RES. (0.10 2W)
R2
601161-17
MET. OX. F. RES. (5600 3W)
R3
601161-18
MET. OX. F. RES. (6800 3W)
R4
601161-19
MET. OX. F. RES. (5600 2W)
R8
601161-20
MET. OX. F. RES. (560 1W)
R9
601161-21
MET. OX. F. RES. (1.5kQ 1W)
R58
601161-22
MET. OX. F. RES. (3.90 1W)
R12
601161-23
HIGH STABILIZED MET. F. RES.
R13
601161-24
HIGH STABILIZED MET. F. RES.
R14
601161-25
HIGH STABILIZED MET. F. RES.
R15
601161-26
HIGH STABILIZED MET. F. RES.
R16
601161-27
HIGH STABILIZED MET. F. RES.
R7
601161-28
CARBON F. RES. (1.2kQ 1/2W)
RIO
601161-29
CARBON F. RES. (5.60 1/4W)
R11
601161-30
CARBON F. RES. (180 1/2W)
R1 7-23,90
601161-31
CARBON F. RES. (IkO 1/4W)
R24,25,39,
601161-32
CARBON F. RES. (lOkO 1/4W)
42-46,54,
68,72,77
R26
601161-33
CARBON F. RES. (47k0 1/4W)
R27,41
601161-34
CARBON F. RES. (1.2k0 1/4W)
63,64
R28-35
601161-35
CARBON F. RES. (3300 1/4W)
R36-38,40,
601161-36
CARBON F. RES. (2.2k0 1/4W)
53,61
R47,74
601161-37
CARBON F. RES. (lOOkO 1/4W)
R48
601161-38
CARBON F. RES. (8200 1/4W)
R49
601161-39
CARBON F. RES. (3kQ 1/4W)
R50
601161-40
CARBON F. RES. (200 1/4W)
R51
601161-41
CARBON F. RES. (510 1/4W)
R52,70,71,
601161-42
CARBON F. RES. (1000 1/4W)
73,88
R85
601161-43
CARBON F. RES. (3.9k0 1/4W)
826
601161-44
FLANGE NUT (M4)
R55
601161-45
CARBON F. RES. (680 1/4W)
R56
601161-46
CARBON F. RES. (5.1k0 1/4W)
^
u
w
7-16
Table 7-12. Parts List (Cont'd)
REV.-A
^
-^
r^
Ref. No.
Part No.
Item Description
R57
601161-47
CARBON F. RES. (4.3kn 1/4W)
R60
601161-48
CARBON F. RES. (82kn 1/4W)
R62
601161-49
CARBON F. RES. (200kn 1/4W)
R65,69
601161-50
CARBON F. RES. (3.3k0 1/4)
R75,89
601161-51
CARBON F. RES. (15kQ 1/4W)
R66,67
601161-52
CARBON F. RES. (6800 1/4W)
78-84
R76,87
601161-53
CARBON F. RES. (200Q 1/4W)
R86
601161-54
CARBON F. RES. (150 1/4W)
R91
601T61-55
CARBON F. RES. (6.8kO 1/4W)
B1
601161-56
FERRITE BEAD
LI
601161-57
CHOKE COIL
L2
601161-58
CHOKE COIL
SW1
601161-59
DIP SWITCH (8P)
CN2
601161-60
CONNECTOR (6 PIN)
CN3
601161-61
CONNECTOR (26 PIN)
CN4
601161-62
CONNECTOR (9 PIN)
CN5
601161-63
CONNECTOR (12 PIN)
CN6
601161-64
CONNECTOR (4 PIN)
CN7
601161-65
CONNECTOR (18 PIN)
CN8
601161-66
CONNECTOR (2 PIN)
CN10
601161-67
CONNECTOR (28 PIN)
350
601161-68
COMI BOARD UNIT
352
601161-69
C.T.P. SCREW (M3 x 8)
353
601161-70
REAR COVER C
R1-3
601161-71
CARBON F. RES. (3.3kQ 1/4W)
C1,2
601161-72
CERA. CAP. (O.VF 25V, -1-80%, -20%)
4A
601161-73
IC SOCKET (28 PIN)
4A
601161-74
P-ROM (27256-CE8-E2)
CN1
601161-75
CONNECTOR (36 PIN)
CN2
601161-76
CONNECTOR (6 PIN)
CN3
601161-77
CONNECTOR (28 PIN)
CN4
601161-78
CONNECTOR (26 PIN)
400
601161-79
COMPNL PANEL UNIT
500
601161-80
CFIL CIRCUIT BOARD UNIT
501
601161-81
POWER TRANSF. SET
502
601161-82
FUSE (MDL-1A)
503
601161-83
FUSE COVER
504
601161-84
FITTING PLATE
505
601161-85
C.P.O. SCREW (M4 X 8)
506
601161-86
POWER CABLE
507
601161-87
CUP SCREW (M4 X 6)
508
601161-89
OUTSIDE TOOTHED LOCK WASHER M4
800
601161-90
SPROCKET UNIT EC
801
601161-91
SIDE COVER R (C) (553-1070)
802
601161-92
SIDE COVER L (C) (553-1080)
803
601161-93
SPROCKET SHAFT
804
601161-94
SPROCKET GEAR
805
601161-95
PLATEN PLAIN BEARING
806
601161-96
SPRING PIN (2x14)
807
601161-97
LEAF SPRING (6 x 0.15 x 11)
808
601161-98
PLAIN WASHER (6x1 x 10)
809
601161-99
SPROCKET FRAME L
810
601162-00
SPROCKET WHEEL
7-17
REV.-A
Table 7-12. Parts List (Cont'd)
Ref. No.
Part No.
Item Description
811
601162-01
PAPER HOLDING COVER L
812
601162-02
PAPER HOLDING COVER SPRING
813
601162-03
SPROCKET LOCK LEVER
814
601162-04
G-PIN
815
601162-05
PLAIN WASHER (3 x 0.5 x 8)
816
601162-06
C.T.P. SCREW (M3 x 6)
817
601162-07
SPROCKET FRAME R
818
601162-08
PAPER HOLDING COVER R
819
601162-09
SPROCKET MOUNTING PLATE L
820
601162-10
SPROCKET MOUNTING PLATE R
821
601162-11
SPROCKET GUIDE SHAFT
822
601162-12
LOCK LEVER
823
601162-13
SPROCKET TRANSMISSION GEAR
824
601162-14
PAPER GUIDE ROLLER
825
601162-15
RETAINING RING TYPE-E (5)
^
KJ
U
7-18
REV.-A
CN8
CATX BOARD
CN1: Not used
4A: Connector CN1 is placed in ROM socket 4A.
Fig. 7-1 5. CATX Circuit Diagram
7-19
REV.-A
r^
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r\
90
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J
O _ Mn ^ o> » « /I
v* ^^ ^ • «» K •(
KK KK K OC K o^ f
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rzb
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o
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o
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jnu o
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Fig. 7-16. C ATX Component Layout
7-20
REV.-A
x^
inoooooooowoiii-
d oj K iri oit- « <j> ^ »o ^N
909099099090
o
000066606666 600660666666666666 6660 60 666666
-R
999 99 99999
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H
i:
u
_ KnOOOOOOQ
K feds
^ojitfi
o I I C I I
Fig. 7-17. COMI Board Circuit Diagram
\^
7-21
^^s.
REV.-A
>^
.25,
J.
1
1
1
1
26
CN4
CI
^^
COMI BOARD
DEC-3V-0
UNIT Y 56120800001
R3
0\
ui
o
z
f»
— (0
28
10 14
CN3
15
14
IS! 1 1 1 1 1 ■ 1 1 uuum
7^ ^
r\
Fig. 7-18. COMI Board Component Layout
7-22
REV.-A
\J
U
-^^
Fig. 7-19. Exploded Diagram 1
7-23
REV.-A
rx
n
r\
Fig. 7-20. Exploded Diagram 2
7-24
REV.-A
^
^
O
00
X^
Fig. 7-21 . Exploded Diagram 3
7-25
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